i had this issue too, but it only became noticeable when the person stood infront on a trasnparent object, like the corporal in Mccarran. I first attributed Doc's ghostly hair to his old age, lol.
I don't got a fix for ya unfortunately, but you are not alone. And my game is incredibly stable and my archives are perfectly invalidated. Sorry pal, wish i could give ya somethings more useful.
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so what i am supposed to do with this? Eat it?