I have this problem that a villager takes a workstation of another villager that is already assigned to that workstation. I have noticed this on my survival world where I have a trading hall and it gets taken by another villager and it is really bugging me out like I'd have to place it back again for the "already" assigned villager to have it's workstation back and it is a no good. I noticed it when I was trading and it wasn't restocking. *Update- They even pathfound themselves through a block!