Hello. When im trying to kill mobs i get server crashed. Tried to use /kill command - same result
1.16.4
crash-2021-02-16_18.28.59-server.txt

Closing all bug related issues as I just pushed a big update. (many changes to the code)
If the issue is still there, please create a new issue and provide new log files.

The 1.8 update is currently BETA which means it's not ready for stable worlds. If you are playing multiplayer I suggest you wait for a release candidate.