Villagers will trace to an invisible workbench that is clearly nonexistent. They do this in Realms a LOT. As you can see in the screenshots, I use the /data get command to see the job site of a villager, and it leads me to the inside of a wall.
MC-177759
Villager's Tracing to Invisible Workplaces
Resolved
Awaiting Response
0
We're having the same problem in the snapshots for 1.16, not on realms but on our server. In our new trading hall half the villagers won't work/restock their trades. When I check their entity data some are assigned correctly (and won't restock even so), however many are either assigned to a job site block belonging to the wrong profession or a position where there is no job site block in the village (and never was one). The problem only started during the snapshots and after we converted the villagers into zombies then cured them. I can't seem to reset their Brain/memory nbt data either, using the data remove command changes nothing.
We've tried everything, moving them around, getting them to sleep, breaking and placing new blocks, bludgeoning them, they just won't update their job site. We managed to fix two by moving them around and breaking/replacing their workstations, so the problem was probably pathfinding for those two; the rest are still broken and have been for several in-game weeks.