“To make it more convenient for destroying villages, we added the wither spawn egg! No more building one at a time. You can now spawn 10 in the same amount of time as of building one manually!” - Mojang
lol that bug was supposed to be fixed a WHILE ago but there are still villagers going through 1 block gaps to get to a new workstation (saw it in a TheDerpyWhale video i couldn't find which one lol)