Minecraft worlds don't save properly

The problem is in the name of level.dat Minecraft saves level.dat with numbers after the name level (example: level-1213141.dat) When opening the world, it looks for the level file, and there is a bunch of level files with numbers. It's the same with playerdata. The game does not find a profile and creates a new one. Also with numbers.

You can fix saving.
Rename the last saved levelxxxxx.dat to level.dat

This will help until the next save, you need to repeat the procedure before starting.

Thank you, it worked but i didint needed to have the last save ... because it wasent theright one. to find the right one i used NBTExplorer. Thanks. Please how we mark as resolved or if I cant please anyone mark it as reesolved

 edit : do i need to make that everytime ? (when its save like in esc menu i have this)

This is not a solution to the problem.
The solution to the problem will be when the developers fix it.
And until it is fixed ... Yes, it must be done every time.
This applies not only to hardcore, this is a problem with all versions of Minecraft Java from the new launcher.

P.S. I have a suspicion that this problem is only on Windows 11

Now it should be done properly.

The Bug:

The world is not saved

Steps to Reproduce:

• Launch any version of Minecraft Java

• Create a new world

• Save and quit the world

Observed Behavior:

The world is not saved.

Expected Behavior:

The world is saved.

I can confirm that I have all these problems. But the thing is that on the old launcher it saves properly, but it does NOT save properly on the new launcher. Level.dat has a ton of numbers at the end of it when saving with the new launcher. No numbers when saving with the old.

Yes, on the new launcher, everything is going bad ( i installed the new launcher bc i have xbox game pass so i need it to have second account)

and mojang HAVE to fix this launcher beacause its really problematic for anyone having this launcher ( i willl test your theory that its only on win 11 bc i dualboot win 10 / 11)

You are right, the problem is only on win 11

⚠️ Please do not mark Unreleased Versions as affected. You don't have access to them yet.

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Is this still an issue for you in the latest release/snapshot?