This also fixes issue with root bone overwritten - which should not happen as it is a hack.
Before the behaviour would create an additional bone which would end up breaking animations completely on import.
Additionally this fixes required bones being removed.
Co-authored-by: K. S. Ernest (iFire) Lee <ernest.lee@chibifire.com>
- Fixed first vertex of each blendshape on a multi-material mesh having all unmapped vertice offsets being added to it
- Fixed blendshapes not importing for multi-material FBX meshes with no bones