Those originally added had bounding boxes that were too large, so I've placed the infected ladders with one that is one unit thinner (as well as repositioned them to not interfere with movement).
The survivor ladder added to the first walkway after the first gate was also replaced with a thinner ladder model.
There appears to be some glitchiness when walking on top of the ladders from being moved to off-grid coordinates, but adjusting the Z position to the nearest 0.5 seems to fix it.
Those originally added had bounding boxes that were too large, so I've placed the infected ladders with one that is one unit thinner (as well as repositioned them to not interfere with movement).
The survivor ladder added to the first walkway after the first gate was also replaced with a thinner ladder model.