I spent around 3 hours trying to get a villager to trade me an unbreaking 3 book, when i finally got my villager to offer unbreaking 3 I traded him some paper for an emerald so he would keep his trades but upon arriving via minecart back at home with the villager I saw him change his profession to a toolsmith, when I tried trading with him after that, the villager remembered that I traded with him but he was now offering level 2 toolsmith trades, not my level 2 librarian I had. I noticed that in 2020 this was a bug too and the forum said it was "resolved" but I am still having this problem.
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Thank you for your report!
We're tracking this issue in MCPE-117852, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Thank you for your report!
We're tracking this issue in MCPE-117852, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
Thank you for your report!
We're tracking this issue in MCPE-117852, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki