We pushed a fix for this issue in version 1995.1
Our latest update clashed with Steam Cloud Saves and caused an issue for some players leading to broken save files. These saves are not gone! Just hidden.
If for any reason the issue persists you can follow the steps below to retrieve your files.
Fix for PC/Mac
https://docs.google.com/document/d/1r7xGdU-bXG_P6X_7_GWZcoyFEUGEjYMj5pEpGdG0Qr0/edit
Fix for Steamdeck
https://docs.google.com/document/d/1Yp8TttN2Fvp-E4HW2Shs8RnVznS2KclEacC9sD-suEk/edit?usp=sharing
We sincerely apologize for this issue, unfortunately, it did not appear in any of our QA testing <3