Corrupted save - progress not saving only in one save permanently on different computers

I searched on the forum and despite the fact a similar issue happened before it seems that this one is differentIn a world I played with a friend online from a certain point in time all progress stopped saving. Every other world doesn't seem affected. Online or offline, any time ingame no progress is saved, even players position. Bug is present even on other computers if exporting the world. I was thinking it was a corrupted chunk so I walked away for a couple of game days but on reload (after hitting save and exit) I was on the same position I started. I tried recovering corrupted save methods and it seems the bug is in the MANIFEST file. Below I'm uploading the LOCK, CURRENT and MANIFEST files.