With standard village houses that have a wood block under the door (placed so that it is inward) and a path block in front, Villagers and other mobs started having difficulties entering (due to the height difference in the blocks). This usually prevents them from entering at all, and they instead stand next to the wall of the house that is closest to the job station/bed they wanted to get to. By that they do not restock their trades and are exposed to monsters at night. 

Even without path blocks in front of the doors they have started having trouble finding the best path right to the destination, not walking up stairs but staring at a wall that has a shorter direct distance etc. When pushing them toward the walkable path, they will frequently run back to the place they have stood in, making trading more difficult when they don't restock their trades.