Every material that has Texture Coordinates setup comes into Unreal with a Mask node with R, G enabled and it causes a shader compile error. If you disconnect this node the shader will compile correctly, but you lose the mapping that was setup in Blender.
Every material that has Texture Coordinates setup comes into Unreal with a Mask node with R, G enabled and it causes a shader compile error. If you disconnect this node the shader will compile correctly, but you lose the mapping that was setup in Blender.