crash report: https://paste.dimdev.org/eduhuviruk.sql
using 1.12.2 version 26.4.88

when did this crash happened/what where you doing at the time? it looks like the registry Ids of the blocks shifted.

Maybe JustEnoughIDs can cause this.

We don't support 1.12.2 anymore. If this happens in a newer version please open a new issue.