My world has dissapeared from the instance and I can't load into it anymore

[MoldingBin]

Modpack

FTB StoneBlock 3

Modpack version

1.10.0

Launcher

FTB App

Has the pack been modified

No

Log Files

2024-08-22-1.log.gz 2024-08-22-2.log.gz 2024-08-22-3.log.gz 2024-08-23-1.log.gz 2024-08-23-2.log.gz 2024-08-24-1.log.gz 2024-08-24-2.log.gz 2024-08-24-3.log.gz 2024-08-24-4.log.gz 2024-08-24-5.log.gz 2024-08-25-1.log.gz 2024-08-25-2.log.gz 2024-08-30-1.log.gz 2024-08-30-2.log.gz debug.log debug-1.log.gz debug-2.log.gz client.txt rei.log rei-issues.log 2024-08-22-2.log.gz 2024-08-22-3.log.gz 2024-08-23-2.log.gz 2024-08-23-3.log.gz 2024-08-24-2.log.gz 2024-08-24-3.log.gz 2024-08-24-4.log.gz 2024-08-24-5.log.gz 2024-08-24-6.log.gz 2024-08-25-2.log.gz 2024-08-25-3.log.gz 2024-08-30-1.log.gz 2024-08-30-2.log.gz console.log debug.log debug-1.log.gz debug-2.log.gz debug-3.log.gz debug-4.log.gz debug-5.log.gz latest.log

server.txt startup.txt

debug-3.log.gz debug-4.log.gz debug-5.log.gz latest.log

Describe the bug

Instance in the FTB launcher doesn't show backups tab for the world that should be there. There is a world saved in the instance but on the startup of the instance and trying to enter singleplayer world, it only shows me the "new world" start screen.

Steps to reproduce

1. Load instance
2. Click singleplayer
3. World doesn't appear, instead new world screen appears

Expected behaviour

My world would appear in the singleplayer world selection.

Screenshots

Additional information

This original save has been moved multiple times now because I've had a separate issue with this modpack where my world wouldn't open when trying to load it. I have figured out a way for it to wok every time, but this time when I tried to load it, my world just wasn't there anymore or somehow wasn't loading.

[Gaz492]

Looking at the logs you provided it looks like minecraft cant read the level.dat for your world due to an issue with a tag id.

[30Aug2024 17:26:35.900] [Render thread/ERROR] [net.minecraft.world.level.storage.LevelStorageSource/]: Exception reading C:\Users\moldy\AppData\Local\.ftba\instances\shit better work copy\saves\bone\level.dat
java.io.IOException: Invalid tag id: 101

I would suggest manually restoring one of the backups you have by renaming your current world folder to have _broken at the end of it, then in the backups folder right click the most recent backup and select Extract All..., once its extracted the files, move the extracted world folder into the saves folder and see if minecraft will let you load it up.

[MoldingBin]

Looking at the logs you provided it looks like minecraft cant read the level.dat for your world due to an issue with a tag id.

[30Aug2024 17:26:35.900] [Render thread/ERROR] [net.minecraft.world.level.storage.LevelStorageSource/]: Exception reading C:\Users\moldy\AppData\Local\.ftba\instances\shit better work copy\saves\bone\level.dat
java.io.IOException: Invalid tag id: 101

I would suggest manually restoring one of the backups you have by renaming your current world folder to have _broken at the end of it, then in the backups folder right click the most recent backup and select Extract All..., once its extracted the files, move the extracted world folder into the saves folder and see if minecraft will let you load it up.

So i was able to get my world to work. The level.dat file was corrupted as you said so first i tried deleting the new one in the folder and renaming the old. Didn't work. Then I took the level.dat out of a backup and tried that which worked. Issue solved. Thank you.