Shadowhertz vanished in multiplayer when I tried to pick it up with a full inventory.
I think these are the steps involved:
- In multiplayer, have Player 1 pick up Shadowhertz from the pile in Sanctum of Flesh.
- Have Player 2 attempt to pick up their own Shadowhertz, but with a full inventory.
- Player 2 will get the “inventory full” dialogue, then the item will disappear without entering the inventory.
Haven’t tried to reproduce yet. Might apply to similar items.