I don't know, I'm really upset that you lost your savedata though and I want to try to figure out why 
Can you try making a new savefile in the old build and switching forward again? I wanna see if this is a legitimate issue in the new builds so we can fix it.

Can you try making a new savefile in the old build and switching forward again? I wanna see if this is a legitimate issue in the new builds so we can fix it.
