When I combine enchantment books in an anvil then take the combined books and enchant an item it gives the item enchantments that it shouldn't have (such as a sword having protection)
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Ok thanks I didn't know that that was a thing.

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We're tracking this issue in MC-95555, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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You can enchant anything with any enchantment in creative mode