Editing material crash when in modeling mode

Development Asset Creation
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1

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Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000050

UnrealEditor_Engine
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_MaterialEditor
UnrealEditor_MaterialEditor
UnrealEditor_AssetTools
UnrealEditor_GLTFExporter
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_PropertyEditor
UnrealEditor_PropertyEditor
UnrealEditor_SlateCore
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
user32
user32
InkObj
atlthunk
user32
user32
UnrealEditor_ApplicationCore
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

When I used the modeling tool to separate the material of a model and create a second material, the software crashed when I clicked on the original material instance.

2

Which version of the engine?
Where did the original model come from? Can you share it?

3

Hello, i use the UE 5.1 and the mesh is from the blender demo project.