Device: Xiaomi Redmi 1S 1.6GHz Quad-Core 1GB RAM
Everything can be seen on the Screenshots, They rapidly open/close the door which causes lags.
They should have go to the other Small House on the right but it doesn't have door.
UPDATE: Destroying the Door that has a Villager Inside the Small House will crash the game.
Temporary fix was adding Doors to that other house, the Villagers that filled the house before now moves to the other house but the game still crashes when destroying the door if there's a villager inside.