I created a world in 20w45a and have been upgrading it to every snapshot so far, and in 21w05a I tried using the /setblock command to place cave vines in the world (I tried to replace a barrier block, however the type of block may be unimportant), after that I noticed that the world was bugged and would not save and close.
Using the 'save and quit to title' button just hangs the game, same with F3+C, the only way to close the game that I found is by ending it in task manager.
This bug does not appear to happen in worlds created in 21w05a
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duplicates 1
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MC-213788 describes the freeze effect, but not the full scale of it. The effect starts when joining the world and does not go away, however the day/night cycle is not affected.
Minecraft also does not save any changes that happen in the world since joining.
I suspect that the bug may be causing this section of the log:
[18:38:16] [Server thread/INFO]: Joey_Creepkiller[local:E:b828c3e6] logged in with entity id 215 at (-264.33039109613156, 64.0, -162.74100920418448)
[18:38:16] [Server thread/INFO]: Joey_Creepkiller joined the game
[18:38:16] [Server thread/INFO]: Saving and pausing game...
The bug may be related to this: [18:38:16] [Render thread/WARN]: Received passengers for unknown entity
Does MC-213788 describe your issue?