Minecraft freezes when 'saving world' on 1.20.4 vanilla offline mode

[gear54rus]

Operating System

Linux

Description of bug

Expected:

• World is saved, user is sent back to main menu

Actual:

• Stuck on 'saving world' screen. Process has to be killed.

Additional info:

Logs.

Does not happen when using normal online launch with the same profile.

Related? #3620 Facing the same on fabric but created a new instance without any kind of mods to be sure.

java --version output:

openjdk 21.0.2 2024-01-16 LTS
OpenJDK Runtime Environment Temurin-21.0.2+13 (build 21.0.2+13-LTS)
OpenJDK 64-Bit Server VM Temurin-21.0.2+13 (build 21.0.2+13-LTS, mixed mode, sharing)

Platform: Linux Ubuntu 22.04.4 LTS kernel 6.5.0-26-generic

Steps to reproduce

1. Create a new clean 1.20.4 vanilla instance
2. Launch Offline while changing name (ex. TestName).
3. Create a new world with default settings and join it.
4. Wait for everything to be loaded, mine 1 dirt block.
5. Press 'Esc' -> 'Save and quit to title'.

Suspected cause

No response

This issue is unique

• I have searched the issue tracker and did not find an issue describing my bug.

[gear54rus]

I saw the discussion on that last issue suggesting that this is purely a game bug. However, I should add that there are definitely launchers out there that don't have this problem (namely TLauncher) so it might be deeper than that.

On the matter of TLauncher I noticed it runs the game with --userType mojang whereas MultiMC does with --userType msa. It might be related or it might not be :) As I haven't found a way to alter these launch params for MMC.

[Wolf68k]

Try using Java 17, since that's what is officially supported.

[The-Only-E]

I know one possible cause. Not having enough disk space on the drive the Minecraft install is in. Because there is no space on the disk, it can't save and gets stuck.