Note: I am reporting this on one of my player's behalf.

Bug: PiglinBrainMixin errors out with an application error when opening a chest. The user seemed to be on a snapshot, so I can understand if your unable to support it.

https://gist.github.com/Siuolthepic/0f326c6c4519cb24c9be2f329aaf8764

More info: The player was in the overworld when this crash happened.

Definitely caused by being on a snapshot, will release a version that works on snapshots soon.

Fixed in 1.0.2-1.17-snapshot

Alright, thank you! Ill push an update out for my mod with support for that in the JIJ'ed version!