Mod: Collective
Version: collective-1.16.5-2.26.jar
Crash report: https://paste.ee/p/hA5Ar

To be specific, the crash happens when running around and loading new chunks.

This has been fixed in version 2.46 of Collective. Thanks for submitting the bug report!

https://www.curseforge.com/minecraft/mc-mods/collective/files

Copied paste to crash log file as the paste has an expiration date.
Server crash log