When world autosaves, it causes a lag spike that freezes everything in the world. If you for example try to break a block during this lag the item doesn´t drop and suddenly game jumps back to the position before the lag spike. Player can move normally but world around is frozen for about 20 seconds.

FPS stays at 140-200 this whole time.

So this happens now EVERY time the game autosaves. Prior to pre-release 5, I did not have this issue (same computer setup and everything). When I start the game in 1.17 there is no issue.