I did a few tests and can't duplicate.
Is this only when you start in CAS or also if you use Plan outfit.
Marking this as needs input for now as it only happened on one save for you as well.
Since seasons I had to give my 52 custom Sims correct winter and summer outfits wich means I started the game and went right into CAS from the manage household view and picked one by one family. When the first 5-6 families were done I noticed the hair color dark brown changed on a child from previous edited household. So I reopen them and the child hair was blond. It was the new curly, nice looking afro hairstyle. And in the same time the music glitch kicked in and never stopped (double music play) I had to restart the game. I know the music issue is another thread, but I‘m just telling what happens in combination with the hair color issue. Maybe the music glitch and hair are somehow related.
