There is something up for sure. Before the SE release (and updates), I was playing around in CAS and aged up a YA to adult, her nose and several other features, even though the nose was the most obvious, changed. Meaning a completely new present. I tried again a few days ago after the latest patch and she doesn't appear to change too much now at least. But that was a shock. I wonder if it would have applied had I aged her up in-game.
I have a legacy with slanted eyes being a feature that ALWAYS get passed down, no matter what type of eyes or size of eyes the other parent have. I have given up on hoping for any other eyes at this point XD
Maybe that's on purpose? Like certain features are supposed to be more common and prevalent in genetics? Or it's just an oversight on the devs part and need some tuning.