Checked for existing issues

• I have checked for existing issues, and have found none.

Tested latest version

• I have checked that this occurs on the latest version.

GregTech CEu Version

1.21 branch

Recipe Viewer Installed

EMI

Environment

All

Cross-Mod Interaction

No

Other Installed Mods

Intellij

Expected Behavior

Not to crash and save the data properly

Actual Behavior

The game tries to save the NBT data of the item (in my case a drum with fluid) and crashes on trying to save: https://mclo.gs/G5vg2QC

Steps to Reproduce

1. Place a drum
2. Input a bucket of fluid (i used water, but it doesn't matter)
3. Pickup drum with a wrench or pickaxe (not NBT copy in creative)
4. Press esc to bring up the menu (and cause a save-event)
   -> crash

Additional Information

Likely caused by invalid NBT saving.