Also they don't emit anger particles when destroying their job site block. Altough they should according to the official minecraft wiki.
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https://www.youtube.com/watch?v=zqUkWSbdYQE
this video explains everything but i still think that the new villager system is strange. Like how do they register a job site block so far from them while not even seeng it.
Did you trade with them before? After completing a single trade with a villager they won't lose their profession even if their block is broken