We know about this, but it's probably not a bug, but simply the uploader completely blacked out the girl's skin in the editor, forgot about it and packed the game.
(Or it's a saves issue).
Anyway, just go into the girl's creator, click the fourth tab (Body) select the Skin tab and lighten up a bit in the bottom left corner
View attachment 4027515
Alternatively just click ‘Create new girl’ and she should have the default appearance settings for the game version