After upgrading my world to version 1.17.1 I noticed that it creates incredible many files below the "playerdata"-folder (more than one file per player).
The new files are similar to tha basic playerdata-saves that are named by [player-id}.dat, but the new files are named [player-id}-13153799585470461216.dat (I thing the number is a timestamp).
It seems that everytime when I go to the pause-menu a new file is created.
What I expected to happen was...:
When playerdata is saved, it should creaty only one playerdata-file (and maybe one `dat_old)` per player.
(or at least the additional files with the timestamps should be cleaned from time to time of on game exit)
What actually happened was...:
The game creates more and more files, and spams my save-folder with hundreds of playerdata files.
Steps to Reproduce: (not sure how to reproduce, these steps may not work, will update if able to find a method)
join a world in version 1.17.1 as singleplayer
hit Escape to open the pause-menü a few times
leave the game and check your "yourworld/playerdata" - folder
I discovered, this happened because a other program on my pc had reading access to the minecraft world files.
After I found and closed the program, this issue never happened again.