If a player has two elytra with identical enchantments and they are full durability, you can put both into a grindstone and when you unenchant them, they become stacked.
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duplicates 1
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Duplicates MC-140397
the elytra both have unbreaking 3 and mending. Also what do you mean duplicates? I didnt go into creative mode and duplicate them if thats what you mean.
nonono this bug report duplicates MC-140397, not you duplicating it in your creative inventory
Hello!
What enchantments are on the elytra? Additionally, are the elytra unbreakable?