The multiplayer server goes into a coma on start up and gets stuck on loading in the new update.

Origins 1.1.4.
Fabric API 0.42.1
Fabric Loader 12.5

And it gets stuck on start_remnant_gamerule not being defined even though requiem has never been installed on it at any point in time.

Here's the log:

https://pastebin.com/3JUJPAi3

There's no datapacks. But there are other mods. Here's the list:

https://pastebin.com/VE5FRXvE

Do you have any datapacks in the server?

This issue is caused by Rat's Mischief, but has been fixed in their latest version (1.3.1).
If you update, the problem should be gone.
If the problem still persists after updating, please open an issue on their issue tracker, and don't forget specifying that you're on the latest version. :D

Rat's Mischief issue tracker: https://github.com/Ladysnake/Rats-Mischief/issues