Minecraft Version

1.19

Immersive Engineering Version

1.19.3-9.3.0-163

How did it happen?

Got it somehow by blowing up 25 gunpowder barrels with a secondary explosion via a vanilla tnt, there was a second tnt ignited as well in the explosion. When they went off, the game froze up and crashed. Probably just too much happened at once which caused it to crash, but figured It couldn't hurt to post the crash here.

Crash Log

https://pastebin.com/ms2fvX0J

This has happen to me too, but with only 1 barrel, it's sporadic and dunno what exactly causes it.
I have tried to reproduce this with only IE but it doesn't seem to crash in that case, but again it could be just coincidence.

Crash: https://gist.github.com/LeoBeliik/84f05ecf8ec53327888ffde36325934e
IE: 9.2.1-164
Forge: 43.2.8

@LeoBeliik try removing rubidium and post a new crashlog please

This is not related to rubidium, we'e simply accessing the set from both client- and server-threads without any synchronization.