What version do you play on? Windows, mac or android? Losing progress from a save not being compatible is something I am trying to avoid. I have no real good way to test it myself but if you're playing on Android I was worried that might happen with how I had to do workarounds just to get it to work.
I think I've finally nailed it down to a process and this update and the previous all use the same Android downloader file which, if again if that is causing people to have to start a new game on Android, then going forward that should be fixed and no longer an issue.
Until invariably something else comes along and fucks everything back up.