when I trade with a villager, what I want to buy becomes a different item

Duplicate of MC-215441.

Thank you for your report!
We're tracking this issue in MC-215441, so this ticket is being resolved and linked as a duplicate.

You need a book (as well as emeralds) in order to buy the enchanted book.

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Yes, but my picture is not correct, sorry, even if I try to trade with a book and some emeralds he can't give me the enchanted book