Bug description

Crash to launcher on loading world in a server environment.

ATM 10 modpack

We've removed the mod for our 1.21.1 release, but will add it back if we can resolve whatever happened here.

Minecraft version

1.21.1

Mod version

1.21.1-1.1.16

Mod loader and version

Neoforge 21.1.8

Steps to reproduce

1. Launch pack
2. Crash

Expected behavior

No response

Log files

https://mclo.gs/9YMz8mY

Screenshots

No response

The server runs perfectly fine using Neoforge 21.1.8.