Warden can't walk past ladders

I was messing around with a named warden and I had it chase me throughout the ancient city. I noticed that it had stopped chasing me so I went to go see what it was stuck on. The warden was stuck trying to walk past a ladder in the ancient city corridors.

The bug:
Warden's can't walk past ladders.
What I believe is happening is the warden is trying to path find through the block that has ladders, but it's hitbox is colliding with the ladder so it can't move forward. Here's a scuffed drawing of what I think is happening.

Steps to reproduce:

• Create a corridor with ladders on one side like in the picture below.
  
• Summon a warden.
• Attack the warden when it is near the side with ladders.

Observed results:
The warden can't walk past the ladder

Expected results:
The warden will walk past the ladder