Reproduction Steps

I'm not able to reproduce this reliably.

I'm using the latest dev build (5e5d6e1).

Crash Report File

https://gist.github.com/magneticflux-/3394221111a7936db42d5db9df852037

Additional Information

Seems mostly likely related to the new inactive_navigations patch?

Possibly a niche case triggering this bug? vigna/fastutil#109

Actually, maybe Minecraft is modifying the list after the iterator is created.

I suppose this version fixes the problem? https://github.com/jellysquid3/lithium-fabric/suites/1551209835/artifacts/27727053

This should be fixed by the linked commit