Why would they "take off" their nails when nude though? Regarding makeup I think it totally depends on the situation, for example if they're going to have a shower I would expect that they would take off the makeup or have the makeup they potentially have with their swimwear, but if they're for example streaking I would expect them to still wear their everyday makeup.
@SqueamishNerdwow, someone actually replied. So do you have this bug too?
And like you, I'm fine with nails showing but having makeup in bath, in a sauna or in the spa, for example, doesn't make sense to me. I just wanted to highlight that makeup showing while in nude/towel/robe is connected to the Spa Day update and nails.
If you get a manicure at the spa, it overwrites the nails you include in all the outfits in CAS, until you want to take the nails off. I think it's connected to that
I had a look in my game, and it seems like sims take off their nails but keep their makeup when getting nude.
Example pictures. First picture is a sim in her everyday outfit, she has makeup and nails. Nails were added in CAS. In the second picture she has taken off her clothes, and she kept her makeup but removed her nails.
I tested if it differed depending on which outfit she had before getting nude, but she always change into the everyday makeup when getting nude, at least for taking baths and showers.
