Update: It probably was (evil) 1/0 magic performed by my RAM. Due to another issue I performed a memory test (memtest86) and it actually found errors even though I had checked my RAM right after installing it.

So the mystery is solved: It was faulty hardware. Thanks for your help!

I've tried my best to find any reproducible desyncs but wasn't able to, sorry. Also, we played multiple sessions on that map, both before and after this evening, and there haven't been any desyncs whatsoever during those times. Good luck with finding the bad magic! ;) Or abandon it as it wasn't a la...

1. What did I do? I was playing with a friend inside a vanilla world trying to get the lazy bastard achievement. We were playing on his save, I joined via Steam Friends "Join" feature. I was placing belts before I suddenly got reconnected and experienced my first ever vanilla-desync. Afte...

I do really wish for the Continue button to also continue Multiplayer!

Also the idea with the last-played map as main menu background is really nice.