HI! Over the week I've been testing stuff and I remembered that I was using windows that were 2 slots big and not appropriate for the curved walls with the move objects cheat, so I wondered if that was causing the issue. I tried creating a blank save and rebuilding the tower, this time making sure the windows had enough space, and... it worked? So far I haven't had the issue again, I can go in out as I want, but I'm still being cautious because I'm not 100% sure what was the issue. I still cant get into the old saves' lots, but at least I'm able to keep playing in a new save...
Thank you for all the help!! Hopefully it won't happen again. 😭