The graveyard crashes my server when the skeleton creeper is about to explode (ticking entity), singeplayer not affected.
Reproduce this by letting a skeleton creeper explode in a multiplayer survival server 1.16.5

Loaded mods + crash rep: https://pastebin.com/zh1BGdNi
[latest.log] (https://github.com/finallion/The_Graveyard_-FABRIC-/files/8216204/latest.log)

Sorry for the late response. What are you still doing in 1.16? This version is no longer maintained, I'm sorry!