In my current household I have three teens. They just aged up a couple of sim-days ago.
I followed my teens to prom, and the auditorium was decorated for prom. I entered CAS to change one of my teens’ outfits. When exiting CAS, I was loaded into my household members that were still at home, and when changing active sim to one of my teens, I see that the prom had ended and everyone else was leaving. The auditorium was back to default.
It happens both with and without mods.
