I found what appears to be a bug in multiplayer where players don't drop items when killed even though they have them. To be more specific, if a player is set as a visitor and killed while holding an item, they won't drop the item, and the killed player doesn't have the item, meaning they disappeared. But, I dropped the item while I was a member. My guess is that this is a bug that happens when you make it a visitor. Please address this as soon as possible.
Linked issues
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duplicates MCPE-47563