Why are objects dissapearing on play

Ok so I am making a Tokyo Ghoul roleplay game in unity, and I imported 2 vrm avatars from vroid studio and I applied a sitting animation to them but when I press play their faces disappear, how can I keep their faces on?

heres a vid on what happens

i think that the alpha value of face color is decreasing lookin at the material of face their might you found a solution