Fresnel node cannot be deleted/ reverts after reopening Material

I have a really weird bug since updating to 4.16 Preview 3:

I have a Fresnel node in my Material I cannot delete. This happened for the first time after I plugged something into ti’s normal input.
This happened today.
Here’s a video:
https://streamable.com/x6rv7

I recreated my Material because of this. In my first material I couldn’t even delete any other node and the Material completely reverted back.

Here’s my Material (copy/paste):

Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_415"
   Begin Object Class=/Script/Engine.MaterialExpressionVectorParameter Name="MaterialExpressionVectorParameter_0"
   End Object
   Begin Object Name="MaterialExpressionVectorParameter_0"
      ParameterName="WaterFogColor"
      ExpressionGUID=C74E6C024BD6E143892EF3B91AAF68C9
      Group="Fog"
      MaterialExpressionEditorX=-555
      MaterialExpressionEditorY=799
      MaterialExpressionGuid=99AAE30D4766AD715E9D47974FF4F50F
      Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_11'
   End Object
   MaterialExpression=MaterialExpressionVectorParameter'MaterialExpressionVectorParameter_0'
   NodePosX=-555
   NodePosY=799
   bCanRenameNode=True
   NodeGuid=34AF59954BB9C749C4B5858E684A1A8B
   CustomProperties Pin (PinId=EC2E8AD84D5FD7B2A01F838D24AB204A,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="mask",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_Root_13 B9F63D9F4ADA84E1C94F31932DE65543,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=2BB9E2FA482FDF83AEE534B2D5AB8363,PinName="Output2",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="mask",PinType.PinSubCategory="red",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=C6717AF34734F0189431788C4E2DEF04,PinName="Output3",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="mask",PinType.PinSubCategory="green",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=692E7D56473ABEABF3E79A83BF048B24,PinName="Output4",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="mask",PinType.PinSubCategory="blue",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=35EB32464BD3EC98A81BD897B4E6721A,PinName="Output5",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="mask",PinType.PinSubCategory="alpha",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_416"
   Begin Object Class=/Script/Engine.MaterialExpressionConstant Name="MaterialExpressionConstant_1"
   End Object
   Begin Object Name="MaterialExpressionConstant_1"
      R=1.000000
      MaterialExpressionEditorX=48
      MaterialExpressionEditorY=960
      MaterialExpressionGuid=5302C0C4465C9074691CE0B9CBC156A5
      Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_11'
   End Object
   MaterialExpression=MaterialExpressionConstant'MaterialExpressionConstant_1'
   NodePosX=48
   NodePosY=960
   NodeGuid=97BC68404A10EB840578E28285ACA76E
   CustomProperties Pin (PinId=C23B76FF4C3543CD3B65FEA6A9CFCC8F,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_Root_13 6D7AF7674E02BEAB1799438CD7D5960B,MaterialGraphNode_Root_13 74D829CF44D00CA0E2A335808054B2A6,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_417"
   Begin Object Class=/Script/Engine.MaterialExpressionConstant Name="MaterialExpressionConstant_0"
   End Object
   Begin Object Name="MaterialExpressionConstant_0"
      MaterialExpressionEditorX=64
      MaterialExpressionEditorY=1024
      MaterialExpressionGuid=5302C0C4465C9074691CE0B9CBC156A5
      Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_11'
   End Object
   MaterialExpression=MaterialExpressionConstant'MaterialExpressionConstant_0'
   NodePosX=64
   NodePosY=1024
   NodeGuid=775FE0D5464EA151F54555AA6AF24544
   CustomProperties Pin (PinId=EC0EABFD4030CB9ED149199A3CCED1A0,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_Root_13 F652720741F5739EE721E48E2F7AA288,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_418"
   Begin Object Class=/Script/Engine.MaterialExpressionMaterialFunctionCall Name="MaterialExpressionMaterialFunctionCall_5"
   End Object
   Begin Object Name="MaterialExpressionMaterialFunctionCall_5"
      MaterialFunction=MaterialFunction'/Engine/Functions/Engine_MaterialFunctions02/Utility/BlendAngleCorrectedNormals.BlendAngleCorrectedNormals'
      FunctionInputs(0)=(ExpressionInputId=471965E548C55D27E606D3832C490AD3,Input=(Expression=MaterialExpressionMaterialFunctionCall'MaterialGraphNode_438.MaterialExpressionMaterialFunctionCall_3',InputName="BaseNormal"))
      FunctionInputs(1)=(ExpressionInputId=7E2E487F49DE5A67E3A1EFA3FD83D041,Input=(Expression=MaterialExpressionMaterialFunctionCall'MaterialGraphNode_439.MaterialExpressionMaterialFunctionCall_4',InputName="AdditionalNormal"))
      FunctionOutputs(0)=(ExpressionOutputId=E2F3EA0E41E2637BBAA2A4A0FEF38E6A,Output=(OutputName="Result"))
      MaterialExpressionEditorX=-405
      MaterialExpressionEditorY=1584
      MaterialExpressionGuid=DFF83FE547EA57680D4E2CB03E406261
      Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_11'
      Outputs(0)=(OutputName="Result")
   End Object
   MaterialExpression=MaterialExpressionMaterialFunctionCall'MaterialExpressionMaterialFunctionCall_5'
   NodePosX=-405
   NodePosY=1584
   NodeGuid=50F77013484FC2813EB8FCADB6D76DC3
   CustomProperties Pin (PinId=31E4D4B84D21438995A1E4AFF058080B,PinName="BaseNormal (V3)",PinType.PinCategory="required",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_438 7DC713CE49E81D5248E99091BDFE8C3E,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=720DF6654042F107317C948218C1E037,PinName="AdditionalNormal (V3)",PinType.PinCategory="required",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_439 CB6D8F8E4B351DF39409AEAE9331D8BB,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=1381FE6A4748C1541D9300AF06145464,PinName="Result",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_Root_13 1C823B5A427A2880C7EC13A9909DBBBB,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_419"
   Begin Object Class=/Script/Engine.MaterialExpressionMax Name="MaterialExpressionMax_0"
   End Object
   Begin Object Name="MaterialExpressionMax_0"
      A=(Expression=MaterialExpressionFresnel'MaterialGraphNode_445.MaterialExpressionFresnel_0')
      B=(Expression=MaterialExpressionMultiply'MaterialGraphNode_443.MaterialExpressionMultiply_3')
      MaterialExpressionEditorX=-794
      MaterialExpressionEditorY=1118
      MaterialExpressionGuid=72E9B38246A2706F56B3FBAB184C9E8C
      Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_11'
   End Object
   MaterialExpression=MaterialExpressionMax'MaterialExpressionMax_0'
   NodePosX=-794
   NodePosY=1118
   NodeGuid=7730D99F43E862B7ECCE42A3B220391F
   CustomProperties Pin (PinId=04EB82704F0198FC58A6D48A4F4748F5,PinName="A",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_445 C7EEA62A43A4598F72A2C7ABDE86DF73,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=6B85C00242591EE34CED4CA481CC897C,PinName="B",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_443 36F00BED47C15C8A4780449548365BE9,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=881C00CD44A8BABF89B91194C05FBC8E,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_Root_13 7AA54E054BDCDB5DD0FA218EC32E33E9,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_420"
   Begin Object Class=/Script/Engine.MaterialExpressionScalarParameter Name="MaterialExpressionScalarParameter_0"
   End Object
   Begin Object Name="MaterialExpressionScalarParameter_0"
      DefaultValue=1.000000
      ParameterName="SurfaceFresnelExponent"
      ExpressionGUID=FF295E0B44081B568637B6A46F41BB68
      MaterialExpressionEditorX=-1568
      MaterialExpressionEditorY=1072
      MaterialExpressionGuid=438370774BE8470A5D820DAE03410084
      Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_11'
   End Object
   MaterialExpression=MaterialExpressionScalarParameter'MaterialExpressionScalarParameter_0'
   NodePosX=-1568
   NodePosY=1072
   bCanRenameNode=True
   NodeGuid=1438710341A6F00989BEE2A432D01ABF
   CustomProperties Pin (PinId=2B8C1C5D4735DC1F9637309433A5618C,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_445 CB5494CD4E57FFC49FEE76B82B5A9443,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_421"
   Begin Object Class=/Script/Engine.MaterialExpressionSceneDepth Name="MaterialExpressionSceneDepth_0"
   End Object
   Begin Object Name="MaterialExpressionSceneDepth_0"
      MaterialExpressionEditorX=-1792
      MaterialExpressionEditorY=592
      MaterialExpressionGuid=0BE20E544F2FB0B5E834618AAECE81BF
      Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_11'
   End Object
   MaterialExpression=MaterialExpressionSceneDepth'MaterialExpressionSceneDepth_0'
   NodePosX=-1792
   NodePosY=592
   NodeGuid=F5C8B5AC4E7A2E3CC3A0719CC1491C13
   CustomProperties Pin (PinId=56DEED534D1C79A821C30382FB2891B3,PinName="UVs",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=E63D88C2454B9A661D4D91BFED19DB08,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="mask",PinType.PinSubCategory="red",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_422 47F8F2D94BA715396C0920AA5015569B,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_422"
   Begin Object Class=/Script/Engine.MaterialExpressionDivide Name="MaterialExpressionDivide_0"
   End Object
   Begin Object Name="MaterialExpressionDivide_0"
      A=(Expression=MaterialExpressionSceneDepth'MaterialGraphNode_421.MaterialExpressionSceneDepth_0',Mask=1,MaskR=1)
      B=(Expression=MaterialExpressionScalarParameter'MaterialGraphNode_423.MaterialExpressionScalarParameter_1')
      MaterialExpressionEditorX=-1638
      MaterialExpressionEditorY=662
      MaterialExpressionGuid=A0D911F64A479C57D9AFEAB333AE6ED7
      Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_11'
   End Object
   MaterialExpression=MaterialExpressionDivide'MaterialExpressionDivide_0'
   NodePosX=-1638
   NodePosY=662
   NodeGuid=0602017C4661B3AA85DC4FA481F314E5
   CustomProperties Pin (PinId=47F8F2D94BA715396C0920AA5015569B,PinName="A",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_421 E63D88C2454B9A661D4D91BFED19DB08,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=A3BC87B7496916CB1671939CC363C264,PinName="B",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_423 D88C99104CF87869A99E6EA837A1406A,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=F63DCC004518744CF95C1AA1E676DF51,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_442 DBC1131542064A7EE67F748F6978ED0A,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_423"
   Begin Object Class=/Script/Engine.MaterialExpressionScalarParameter Name="MaterialExpressionScalarParameter_1"
   End Object
   Begin Object Name="MaterialExpressionScalarParameter_1"
      DefaultValue=1000.000000
      ParameterName="WaterFogDistance"
      ExpressionGUID=3826E3074E3C72804F621B81981F11BF
      Group="Fog"
      MaterialExpressionEditorX=-1901
      MaterialExpressionEditorY=769
      MaterialExpressionGuid=807ACD8C47D0A631D4C2FABEAF836259
      Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_11'
   End Object
   MaterialExpression=MaterialExpressionScalarParameter'MaterialExpressionScalarParameter_1'
   NodePosX=-1901
   NodePosY=769
   bCanRenameNode=True
   NodeGuid=A6D1E16F493E6634095D87BF00E3A5B3
   CustomProperties Pin (PinId=D88C99104CF87869A99E6EA837A1406A,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_422 A3BC87B7496916CB1671939CC363C264,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_424"
   Begin Object Class=/Script/Engine.MaterialExpressionScalarParameter Name="MaterialExpressionScalarParameter_2"
   End Object
   Begin Object Name="MaterialExpressionScalarParameter_2"
      DefaultValue=1.000000
      ParameterName="NormalAScale"
      ExpressionGUID=0179D20D4D82CCA90C6F19A5036F4EBD
      Group="Normal|NormalA"
      MaterialExpressionEditorX=-1808
      MaterialExpressionEditorY=1440
      MaterialExpressionGuid=B8D2BE424689623BAECDEB90537D623C
      Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_11'
   End Object
   MaterialExpression=MaterialExpressionScalarParameter'MaterialExpressionScalarParameter_2'
   NodePosX=-1808
   NodePosY=1440
   bCanRenameNode=True
   NodeGuid=3297059347C61CC1A6811280F8FFE924
   CustomProperties Pin (PinId=DAD0701A49E76ACE97200FA77F15BBBB,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_430 E2EBAC614B0C263514EBEE9A18D35C64,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_425"
   Begin Object Class=/Script/Engine.MaterialExpressionScalarParameter Name="MaterialExpressionScalarParameter_3"
   End Object
   Begin Object Name="MaterialExpressionScalarParameter_3"
      DefaultValue=1.000000
      ParameterName="NormalBScale"
      ExpressionGUID=B42C77EB4BAD59EC682BFB8DDD96AE86
      Group="Normal|NormalB"
      MaterialExpressionEditorX=-1792
      MaterialExpressionEditorY=1984
      MaterialExpressionGuid=B8D2BE424689623BAECDEB90537D623C
      Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_11'
   End Object
   MaterialExpression=MaterialExpressionScalarParameter'MaterialExpressionScalarParameter_3'
   NodePosX=-1792
   NodePosY=1984
   bCanRenameNode=True
   NodeGuid=3C9B416E45D7F5CD64856DBB7605B99E
   CustomProperties Pin (PinId=7028EA844D9D31919F08FC81CF1EED6F,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_429 BFE3F49044289F41526FE7A66FC9EF3C,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_426"
   Begin Object Class=/Script/Engine.MaterialExpressionVectorParameter Name="MaterialExpressionVectorParameter_1"
   End Object
   Begin Object Name="MaterialExpressionVectorParameter_1"
      ParameterName="NormalABSpeeds"
      ExpressionGUID=A03559564B305B5B6EBB858A238F52E2
      Group="Normal"
      MaterialExpressionEditorX=-1920
      MaterialExpressionEditorY=1600
      MaterialExpressionGuid=9B73D822420F90BFD8546592187FDE3D
      Material=PreviewMaterial'/Engine/Transient.PreviewMaterial_11'
   End Object
   MaterialExpression=MaterialExpressionVectorParameter'MaterialExpressionVectorParameter_1'
   NodePosX=-1920
   NodePosY=1600
   bCanRenameNode=True
   NodeGuid=DC20745142E1CE2A0BFC85A64521A5EE
   CustomProperties Pin (PinId=8684BA494A33B973C3755380F9451C38,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="mask",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
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End Object
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End Object
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End Object
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End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_430"
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End Object
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End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_432"
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   Begin Object Name="MaterialExpressionTime_0"
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End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_433"
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   Begin Object Name="MaterialExpressionMaterialFunctionCall_0"
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   CustomProperties Pin (PinId=178615784B4A62EDEE442AB1077793D4,PinName="Y (S)",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_426 C3CA21DA44F1D30457805E870A342B76,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=88F89EE54EFEE42EED1838B1C5573311,PinName="Result",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_431 93D96C2846F5B73E4119CF8215C33AA2,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_434"
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   Begin Object Name="MaterialExpressionPanner_1"
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   CustomProperties Pin (PinId=8106977A4AFD33F923840E82CF9F3CF4,PinName="Coordinate",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_429 D880D63A49D71A917FB4FD989D5D063D,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=EA29BF254EDFF5462C487CB315D3B0B3,PinName="Time",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_432 C9E3BBDA42A329955439819319B0976A,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=D3648931473D444ADC39699D9575B4D3,PinName="Speed",PinType.PinCategory="optional",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_435 BE6FA7244E1E26F992E49C95CE100EBF,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
   CustomProperties Pin (PinId=93449EC24F5C7CD0283352B13A32E6A9,PinName="Output",PinFriendlyName=" ",Direction="EGPD_Output",PinType.PinCategory="",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,LinkedTo=(MaterialGraphNode_437 F3067A76477AE3F1DFD390B94FDEF159,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)
End Object
Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_435"
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End Object
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End Object
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End Object
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End Object
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End Object
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End Object
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End Object
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End Object
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Begin Object Class=/Script/UnrealEd.MaterialGraphNode Name="MaterialGraphNode_444"
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Raildex_

Thank you for submitting this post. I have reproduced this issue and logged a report for it here: Unreal Engine Issues and Bug Tracker (UE-44882)

Funny enough this issue can be reproduced with several different nodes and is quite serious. This is a regression from 4.15.2

You can track the report’s status as the issue is reviewed by our development staff. Please be aware that this issue may not be prioritized or fixed soon.

Cheers,

Ed Burgess

Thank you. Do you know what exactly causes this so i can avoid it?

This was introduced by some underlying framework changes. We have already fixed this issue and it shouldn’t occur in the actual release build of 4.16

There really isn’t a way to avoid this unfortunately. Once the problem starts coming up this will really block workflow which is why we issued a fix ASAP.