Teng
7
These are most likely some kind of bugs related to the peculiarities of the servers.
I’ve only had 3 or 4 instances in offline play in 3 years (and purges happen almost every day) where NPCs spawned inside a building. The last one was about a year ago. The rest of the time nothing happened, and they walk to the intended corner on the ground. I see no reason not to consider this a random glitch.