Describe the bug

When shooting a mythril bow at any modded mob, and killing it, the mythril bow will drop from the players inventory as if the drop key was pressed. This only happens with non-vanilla mobs

To Reproduce

Shoot a modded mob with a mythril bow.

Expected behavior

My bow to not be arbitrarily made of butter whenever it feels like it

Screenshots

Bow that I am using, does not have any curse or anything that should be causing this. I am using High Grade arrows with the bow.

Modpack Version

3.1, Other

Server or singleplayer

Server

Version the world was created on:

Other

Other...

3.0.0 world creation
3.0.1 current world

Additional context

No response