[Bug] Could not pass lots of events.

Summary
Got lots of errors in console.
Could not pass these event: EntityTargetLivingEntityEvent, ChunkUnloadEvent, EntityDamageEvent, EntityCombustEvent

This is part of console log.
https://pastebin.com/WgChPatG

Steps to reproduce
Unknown. These errors was found in my running server.

Current behavior
Cause lags.

Server log file
https://pastebin.com/LDETKJLa

Server version: git-Paper-294 (MC: 1.16.4) (Implementing API version 1.16.4-R0.1-SNAPSHOT)
MythicMobs version: MythicMobs-4.10.1 (release)