When I loaded a map with a full automatic reeds farm, there were ghost items that can't be picked, not by me or a hopper or anything else.
Yet it can be moved by water, placing/breaking blocks like any normal drop.
They still despawn after 5 minutes.
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Duplicate of MC-4, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.