By combining two items in a crafting interface, if one or both items are enchanted with Curse of Binding or Curse of Vanishing, the curse will be removed along with the rest of the enchantments.
Linked issues
duplicates 1
Comments 3
Thank you for your report!
We're actually already tracking this issue in MC-158807, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved as Fixed. The fix will arrive in the next version or is already included in the latest development version of the game.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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That's supposed to happen. Use an anvil to add enchants or combine them, use a grindstone to get rid of them for XP, and use a crafting table to get the durability back and get rid of the enchants.