Some of my saves cause crashing in my game

Which platform? PC

Any mods or cc? No

Game version PC: 1.121.342.1030

Original cause: After using MCCC to teleport sims, my game started crashing frequently. It was before latest big update.

Situation now: I removed all mods, that didn't help, started new save, that didn't help, and cleared my user folder, that did help, I was able to finish creating a sim without crashes. But when I put my saves back it crashed again in few minutes. It clearly isn't isolated to one save, because it keeps happening in the new save I started after removing mods.

What can I try to repair it? Is it possible to do it without loosing all my legacy saves? The one where it started was me completely remodelling BG worlds and I worked for months on it.