When dropping an item, it normally comes with a tag Thrower which contains the UUID of the player who threw the item. However, if you hold an item with your mouse and then exit a container (e.g. a chest), then the Thrower tag doesn't exist.
MC-198179
Dropping an item by exiting a container causes the item to not be associated with the player who dropped it
Resolved
Duplicate
0
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-177389, which is a report that has not been resolved yet.
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