This might have something to do with the push back that our weapons impart... the AI system is not really used to being pushed around (literally) and rely heavily on animations to do everything.
Another thing that might be an issue, the AI do not obey player clips for various reasons, so if these displacement humps were heavily player clipped to make them smooth to walk over, that might affect the NPC's.
On the topic of getting stuck in doors (ie Bot Elevator):
I added a minimum standoff distance of bots from doors blocking their way. The policy of the AI system is to move as close as possible (within .001 units) to any obstruction, doors included. With lag and other issues at play, this resulted in doors catching the bots and moving them. in v4.2.1, I set the standoff distance to 8 units, which should afford plenty of clearance.
Let me know if the bots continue to get stuck in doors as this is a very intermittent issue.