I have multiple villagers that will just randomly change professions, even after i have traded with them to set the profession desired. I make multiple trades with them, and then some time later will check back with them, and they have switched professions, and are now locked into a profession that was not the one I traded with. I have had this happen on multiple villagers. I can open the trade with them, and see their experience has gotten to where it was before the change, but they seem to be locked in after the final change.
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We are seeing the same issue, although not on as large a scale. My Wife and I are both on Bedrock Edition on Xbox, seperate consoles, playing on a Realm.
We have saved several towns, put up walls, and ensured employment for villagers, and increased our Librarian section in each town, with between 4-8 librarians. We use nametags and name them to quickly identify them by what they are selling (Mr. Mender, Ms. Unbreakable, Ms. Silky, etc). We do the same thing with Farmers (Mr. Carrot, Mr. Wheat, Mr. Potato, etc). We have had Librarians change professions AFTER being leveled up to master - for example, we lost Ms. Efficiency IV as a librarian, when we came back one day and she was now a fisherman. Likewise, my wife had leveled Mr. Carrot in one town, up to a master level farmer, and he decided one day that he would now be a Librarian.....selling bookshelves....

Duplicate of MCPE-53234

Thank you for your report!
We're tracking this issue under MCPE-62080 so I've requested this report be 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.
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I am having this issue also, I will find a cleric to trade zombie flesh with, level him up to level 2, name tag him, and then put him in a building with my other clerics/brewing stands. I will look away and come back and he has changed to a leatherworker or fisherman. still nametagged and still level 2 but different profession