Describe the bug
Hopper under grinder crashes game

Steps to Reproduce
Steps to reproduce the behavior:

• Place grinder
• Place hopper under grinder

Screenshots
https://im2.ezgif.com/tmp/ezgif-2-59077170f608.gif

Environment (please complete the following information with the version):

• Minecraft: [1.16.4]
• Mod Loader: [fabric]

Logs
crash-2020-12-03_23.03.56-server.txt

It is exception from LBA. It is of a latest version?

https://github.com/AlexIIL/LibBlockAttributes/blob/a519e0de7cc74e1ffae9b530c289684835e1c66b/src/main/java/alexiil/mc/lib/attributes/CompatLeveledMap.java