Mobs cant reach stairs from lava far from iron/snow golems.

The Bug:

i'd tested the world called Hostile Zombie Defense, I tested on their world on fault.

 

Reproduce:

1. Place the bridge that sizes small

2. Summon Snow/Iron Golems on end of the bridge.

3. Fill the lava on the wall

4. Spawn Mob spawn eggs.

  -that zombies would not can't see being stabilty