Sim families disappearing, become empty households

I’m having this problem, too, after purchasing and downloading University pack. And most families that get deleted are from San Myshuno and Newcrest. Otherwise I had mods that dated back to 2014 and they weren’t a problem on three separate laptops until University of this year (2020). I downloaded some mods on 12/30/19 and 1/10/2020 and have restarted my game multiple time with those mods removed but once I touch that one allegedly corrupted family, 3 families in San Myshuno vanishes. I’ve used Tray to see if all the families that were going missing shared something in common and I found out it may have been a shoe. I removed that, game was doing okay for a few saves, until I hit certain families that are causing others to be deleted. At this point I’m almost positive University just isn’t working with some mods but I can’t determine which and it’s frustrating as Sims isn’t that playable to find them all. I also noticed most of the families that are being deleted have pets and they’re families in Newcrest and San Myshuno—mostly.