SurfaceAppearance causes model to look "albino"

Hello! I was porting models from an another game, when I noticed a particular model (76mm Obr. 1927 field gun)'s SurfaceAppearance messing up the textures. Is there a fix?

  • What are you attempting to achieve? Add SurfaceAppearance to a model.
  • What is the issue?: SurfaceAppearance messes up the textures, makes the model look gray. (bottom model)
  • What solutions have you tried so far?: Removed SurfaceAppearance. (top model)

Note: Ignore the background models, as they’re simply untextured and unaffected by the bug. Focus on the field gun.