I've just completed an area with lots of poison over the ground
in the Morgue near the House of Healing in the Shadow Cursed Lands
which I struggled a bit with as my companions
wouldn't follow through the hazardous area and just stopped, so I had to manually keep moving them through it individually.
I do think there is code that should make companions navigate around traps or stop when they can't find a safe path, but it just only seems to work sometimes. I guess all we can do is report and hope that there are just some bugs that are leading to the problem that can be fixed.