What happened?

Title.

BCLib

bclib-21.0.13

WorldWeaver

worldweaver-21.0.13

Fabric API

fabric-api-0.115.1+1.21.1

Fabric Loader

0.16.10

Minecraft

1.21

Relevant log output

https://pastebin.com/YT8aphez

Other Mods

No other mods are loaded.

Same issue on my end, although I have a ton of other mods installed alongside it. It only occurs when I try to create a new world