[2023] Were there a patch today ? My save seems corrupted

There was not; Patch 1.9.2.1 was released on 2023-06-21 with the checksum a370. If you are subscribed to any mods, that would have been an update to one or more of them probably.

Which does not explain your save game problem. What is actually happening with it? What patch version was it started under?  

From that, I don't think the problem was your saves as such (since a reboot cannot possible un-corrupt a save or any computer file!), but some external issue.