Minecraft wiki entry for Villager, associated text: Zombies, zombie villagers, husks, and drowned seek out and attack villagers within a 42-block radius‌[Java Edition only] or a 16-block radius‌[Bedrock Edition only] (even when the villager is invisible). Zombies attempt to break down doors, but only a fraction of zombies can do so and can succeed only when difficulty is set to hard. Zombies who cannot break doors tend to crowd around a door that separates them from a villager. If a zombie or a drowned comes across a set of doors with one open, it usually tries to go through the closed door.