Hello there. There is a subforum dedicated for bug reports of all sorts, if you happen to find more bugs in the future. I'll see if I can verify the bug, NPCs might get stuck in the docking animation. Thank you for reporting, nonetheless.
//edit: You probably just got a little unlucky. After I spend quite some time at the hole, no NPC got stuck. If you experience the same problem again, it'd be good if you could screenshot it so we can see which patrols do cause the issue.