Pirate
(Pirate)
797
This is an art export issue. Make sure your head asset is skinned to the skeleton headbone and exported out properly before importing into unreal.
Sounds like a bug with unreal and structs. You are using 4.10? I know in 4.11 a lot of struct issues were fixes (not all but it was a good start).
I will test with 4.12.5 when I get a chance and let you know if the bug still persists.