When I asigned a work a villager like librarian, in some cases the villager could duplicated the enchanted books.
I think it's a bug related a fixed bug "MC-153195" whi I think is a related bug? because the enchanted books are the same in one librarian villager.
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-71354, which has been marked as Works as Intended - this is an intentional game feature. If you have a different opinion, please visit the Feedback website.
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