the villagers are no longer intelligent and the zombies kill they

I made a new world called stoner XD in which the surface is superflat and find a village and found when they removed and crops in earlier versions of minecraft became villagers to plant what I reap some noise and do the most important thing when night falls do not hide from the zombies or seek home when I built a whole lot I run out villagers houses night after night I have to spawning in the village thanks for your attention