here is how to fix it with any game that support Steam Cloud Saving in the future if that ever happens to you with any game again:
Switch from within the game back to Steam (E.g. CRTL & Enter to switch to Window mode, Windows Key, or AlT & Tab or CRTL & ALT & Del,. depending on the game, in Steam, go to your library to the game ypu have issues with –> right click –> properties –> disable Steam Cloud –> Kill the game using WIndows Task Manager
This way your savegame that is still fine and lives online on the Steam Cloud Servers are not synced with the broken local ones when exiting the game.
In this moment, it is a good idea to make a backup copy of your local savegame folder just in case, tho
Now, re-enable Steam Cloud in the games properties in Steam and Play the game again, this way the intact savegame files are downloaded from the Steam Cloud and the corrupted local ones being overwritten, and voilla 🙂