Biscote

It was solved from a day to the next, and the zone that crashed everyone's game can be visited like any other place of the server, so to us it is solved

To answer your question we weren't using any resource/behavior packs

Thanks 🙂

I have a kind of similar (maybe the same, that's why I comment it here) bug :

With friends we play on an (external) server, and until 1.20 everything was perfectly fine

Since 1.20, all of my friends can join the server normaly, but when I do, I don't load correctly (see what the console says at the very bottom of this comment*), and then the server crashes. At first we thought it was a problem with the host, since it is on an external server, but when we tried loading the world like a normal multiplayer game, all of my friends could join and played normaly, but when I connected, it crashed me and the person hosting the world, and so everyone got disconected.

Like OP, when loading up older saves of the same world, we experience the exact same thing, when others play everything is okay, but when I join, the server/hostworld crashes.

Also, sometimes (seems random when it does that) when I join, the server doen't totaly crash, but I can't spawn, and my friends experience the same problems as in OP's post and update

Edit : I forgot to say this, but when trying to load the world by myself, it says an error message (world import failed)

*console :

{I connect to the server}

[2023-06-12 17:28:41:965 INFO] Player connected: {myname}, xuid: {my xuid}
corrupted size vs. prev_size

{I still see the loading screen} {i disconect, does nothing} {i stop the server from the dashboard}

stop

In some other cases it sayed an error code "8c4937c1-64cb-3532-a8dc-1deb28f67293"