If you repeatedly right click an item very fast, it sometimes duplicates, haven't got it to work in survival, only creative.
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migrated
MC-7202
Inventory Item Duplication
Resolved
Duplicate
0
migrated
migrated
(Unassigned)
Unconfirmed
Snapshot 13w02b
Retrieved
Duplicate of MC-341, please use the search function to see if your bug has already been submitted. Currently over 42% of tickets are being closed as duplicate.