StoneBlock pack/server uses LootBags and recently when they reconfigured their configs this old bug came up. Perhaps you could put a check in the mod that captures illegally bounded object and disables it.

Server Crash Report: http://paste.ubuntu.com/p/W59P25PhFZ/

Old bug that is similar: #8

StoneBlock's alternate config that does not work: https://gist.github.com/knoxhack/cff37eec0eccd86a4581b14af1be069f

Crash report thread at StoneBlock in regards to this issue: Sunekaer/stoneBlock#320

Same issue, resolution is in #159