Context

The server is running a modpack with lots of mods. Recently updated from Create version 0.5.1.f. Has been running fine for a couple of weeks, restarted and is's running fine again. It's not recurring issue (or not yet at least), but here's a crash report if you have time to look at it.

Tell me if you need more context!

Crash Report

https://mclo.gs/4KT91O7

Looks like #6053 or #6668, probably the latter if it's not consistent.

Also, I noticed that after this crash some of the elevators on the server has moved to y=0. We've had this problem a lot before the update whenever the server crashes.