Put simply I found a duplicant stuck on the ladder pictured below because of the "Suffocating" notification. I watched for a while (...well only like 15 seconds I was worried about the duplicant dying.) and the duplicant was just repeatedly hopping between the left and right ladders. My guess is pathing was confused by where the nearest source of oxygen might be? Or just the fastest way up and it for some reason thought it wasn't on a ladder in between hops and tried to go to the nearest ladder resulting in an endless loop between the two. Given when duplicants tend to go up for air and how little oxygen she had left I imagine she'd been there for a while.
I did save the duplicant by giving a "Move to" order to the bottom of the right ladder and she seemed to have figured out how to actually climb after that.
If it helps, as per my colony name, all my duplicants are narcoleptics... which is why I only have 5 by cycle 32. 
Having had a double width ladder for most of the colony's lifespan and an additional 4 cycles after the occurrence without that particular issue happening more than the once pictured here I'm not entirely sure how to reproduce it, My guess is to just have two ladders next to each other that extend towards something a duplicant needs, like Oxygen, and have them spend time below the ladder until they decide to go up it.
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