naked body texture overrides the textures of clothes and hair

so i have this save with my ocs and i wanted to make the genderswap version of it, copied the said save and started doing the thing, changing characters' genders in cas because i didn't want to lose their relationships, memories, careers and so on. one character turned out totally normal while the other one just turns beige the second you enter the in-game mode. the further the camera is, the more this becomes visible, you can see how polygons get colored with the body texture one by one as you move away.
this is the first time i see a bug like this and i couldn't find any similar cases. all my mods are updated and i tried removing the most problem-causing ones from the folder, didn't help. tried to reset bathing outfit and was met with the same result. it happens to everything she wears, even maxis clothes, and even when the character is naked, to her hair, makeup, eyebrows, body hair and eye color. my better exceptions mod doesn't detect anything alarming or conflicting.
also once she hugged the other character his clothes' textures got transferred on her model as well??? you could write a creepypasta based on this i swear