The trade of the villagers from previous versions are not updated in the new version. An example is with the booksellers that in previous versions a book with a quill gives you emeralds but the new villagers booksellers give 2 books with a quill for emeralds but the villagers are not updated their trades and this can affect updating the next trades in the future.
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[Mod] OcelotOnesie
Thank you for your report!
We're tracking this issue in MCPE-69757, so this ticket is being resolved and linked as a duplicate.
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