Disappearing items after Boss rush

[undone turtle]

Bug Description:
Items disappear when thrown out and certain interactions don't give items (Treasure bags, Tax collector, Extractinator). Nothing seems to fix it except restarting the world.
The effect seems similar to this bug: https://discord.com/channels/225030931008847874/1080963246879670282

How to cause it:
Start multiplayer server. Start boss rush and defeat the first boss. From now on the bug should be active (it activates sometime between defeating the first boss and spawning the second one).
I can't trigger it in singleplayer. It worked in a new world. I haven't tried it with a new character.

Multiplayer: yes
Windows / Mac / Linux: Windows 10
Does your computer have a dedicated graphics card: yes
How many GB of RAM do you have: 8 GB

[agile barn]

I've seen this happen before myself, I'm pretty sure it's a classic case of multiplayer desync or the world committing Schrodinger's Cat.
What I mean by this is that sometimes the world can die on one player's end, leaving the other players able to explore whatever section of the map is immediately loaded. Traveling too far leads to chunks of the world temporarily unloading, and dropping anything during this time leads to the item being permanently deleted.

I haven't seen this happen with Boss Rush in particular, but I'm certain it's not the only way to trigger this.