Trying to create a new world with only L2 Backpack, Randomium Ore, and their libraries installed causes Minecraft to crash. L2 Backpack is first in the stacktrace so I am starting here.

Minecraft: 1.20.1
L2 Backpack: 2.4.28
L2 Library: 2.4.31

Log.

Randomium seems to access item tooltip before player is available. Will fix

fixed in 2.4.29