I made a villager trading hall and placed a Lectern in front of one. He took the profession, but I didn't like his trade, so I broke the lectern. He didn't lose his profession, so I thought that it was not the right time of day. But, I camped out next to him for an entire Minecraft day, and he never lost the profession. This happened twice after that with a Fisherman and a Cleric villager. I never traded with any of the villagers, so it makes no sense why they wouldn't lose their professions. I searched online, and I see that this has been a problem before. I don't see any solution to the problem though.
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Having this problem and some villagers wont take a profession, despite me placing the blocks for it.
I am also seeing odd behavior with villagers in 20w13b. If I have a workstation out and they lock onto it, even if I take it down, they won't lose their profession until next day. I have also seen villages pick up professions from other villagers as in one case I had my lectern put in a chest while I finished construction on the building. Several days go by and the last guy I was working the lectern on was a novice librarian with a completely different set of choices than I left him with.