Villager didn't change profession even after removing the original job site block and being further away from the village that it came from. It can also somehow use the Lectern as it's job site block but still be a Shepherd and didn't change into a Librarian.
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Thats not a bug, You have to wait after a specific time before it can unclaim its job. I dont know the time but im pretty sure its 5 PM (In-Game Time) and also dont kill the villagers unless you have a breeder and its close to the place you want to deposit. But another reason (Which you didnt do) is if you trade with it which permannently locks it in.
Chandler
Duplicate of MC-153617