https://pastebin.com/AbNFF706

Incompatibility with MCDoom is also an issue. In general, attempting to take an item out of the backpack causes a crash.

Additional crash reports:
https://pastebin.com/59YDh0gj
https://pastebin.com/WdadMRZm

A fourth one, that possibly reverted a chunk on our server:
https://pastebin.com/pwhe6y6e