Hello, Creator and Dev of Mod pack Friends United. I am currently working on an update and I am testing the Delightful version 3.1.2. After updating to this version it appears to have a major game breaking bug that not only lags a server out almost instantly. but also refuses to allow players to create single player worlds or even log into a server with identical mod installs. I'll place logs and crash reports but I have tested multiple possibilities and the only fix for the issue was downgrading Delightful to 3.1.1

https://bytebin.lucko.me/udzbkrXjT3
https://bytebin.lucko.me/x4E9qyRWiA

crash-2022-10-27_09.32.39-server.txt
crash-2022-10-27_09.33.44-server.txt

I'm struggling to find any issues regarding my mod in these logs. And I can not reproduce.

@Zelioth updates your mod 'Earth Mobs'.
Corail31/tombstone_lite#112
Mods using mixin can make nested errors.

Near the bottom of the first crash report:
"Suspected Mods: Corail Tombstone (tombstone), Minecraft (minecraft), Forge (forge)"
So check on the Tombstone mod?