In case anyone else needs the answer, I have figured it out.
- Open the master material (M_FogSheet_Master), connect the 3 Material Functions that have lost their links. Compile/Save.
- Open the material instance (M_FogSheet_Master_INST), and drag the Parent Material (M_FogSheet_Master) in General. Save.
- Edit BP_FogSheet, Select the “Add Static Mesh Component” node in the Construction Script, and drag in
SM_FogSheet_Plane into the Details for the Static Mesh. Compile/Save.
I hope this helps.