Generations Bug Thread - Please see compiled list on first page before posting.

Well, my game's been running fantastic and I just have one rather depressing glitch- One of my families had twin girls while I was playing another family for a few sim days, and when I went back to the family with the twins one of the twins was gone! The girls were toddlers and the one who disappeared still appears in the family tree, but she's not in the relationship panel. I'm not sure if this is because of generations or something else?

I have no mods or CC, only stuff from the sims 3 store.

Game versions:

1.22.9.011001 Base Game
8.0.152.011001 Generations