Since Quark is busy fixing dupes and other things, I propose to fix the toughest bug in minecraft, which can break all blocks, even portal frames, spawners and lootr chests and so on.

https://youtu.be/kQ7tGZybSNw

no starting in CLIENT.
in server - starting..

2023-07-10-6.log
debug-5.log

Something is wrong with that jar, if it's not finding mixinextras.