Hi! Did you by any chance use an old save from the old version?
After the name change in July 2023 Academy34 has a really hard time with old saves, so they cause a lot of problems. So if that was your case, we suggest you to do a clean install and start a new game.
We tried our best developing a migration system for saves, but it's not working 100% of the time.
Sorry for the inconvenience :c