[Bug] Stacks combining

[sumato-baka]

If there are 2 incomplete stacks in the inventory, which for some reason cannot be combined manually, then the game freezes when sorting the inventory.

[JaisDK]

do you get a crash and what version are you using?

[sumato-baka]

Version: 1.20.1
The game freezes completely. Ending the process in the task manager helps.
If the mod is installed on the client and inventory is sorted in multiplayer, the server freezes.
I have not tested the behavior of the game when the mod is installed on both the client and server.

[JaisDK]

I'll have to look into why it craps on stacking items with empty NBT tag. The problem you're having though is a mod that adds the empty tag causing the unstackable items.
If you want them to stack you can throw them on the ground.