Here is another demo, this time on mp_chateau, also showing bot behavior when they are trying to get to an unreachable node. It's in the transmitting room, where the bots sometimes also gets stuck in the doorways leading in, especially the one from the basement. I've seen 4-5 bots lined up, trying to get in but can't because the first one is stuck.
I don't know if you should consider it a bug really since seeing that bot jump around like that actually makes it a bit more human... Let's call it a "feature".