Mob pathfinding fails under certain circumstances / mobs fall on closed turns

Discovered on a Multiplayer Server.

 

Husks fail to clear a simple obstacle course on the path to a Villager.

On an obstacle course with full blocks and stairs going up and down, the Husk shortcuts over a 1x1 air block instead of taking a short detour on solid blocks, thus failing to reach the Villager.

The peculiar part is, the results aren't consistent; sometimes, he fails earlier in the course, but he always fails at the U-turn.

This was tested around 100,000 blocks away from world spawn.