Description

Backpacks placed in the anvil upgrade tab are eaten and crash the game in 1.21.

Crash Log Here

To Reproduce

Need:

• Backpack A (Backpack with Anvil Upgrade)
• Backpack B (Any other backpack)

Steps:

1. Open Backpack A
2. Click on Anvil tab
3. Place Backpack B into anvil upgrade
4. Crash. On reload, Backpack B will be gone.

Something else to note: I have tried the above steps with an Inception upgrade in Backpack A.

Expected behavior

One of two things:

• No backpacks allowed in anvil upgrade, seeing as it would allow a workaround to the inception upgrade
• Backpacks placed in anvil tab can be renamed (my goal here).

Versions

Minecraft 1.21
NeoForge 21.0.167
Sophisticated Backpacks 1.21-3.20.6.1055 (Latest on CurseForge as of this report)

Fixed in the latest release on CF