I build a little village on a cliffside and a build a wall to disable access to village. So i could keep all the bad creatures out.
But soon after i loaded the game i got a notice that one of my hearthlings died (killed by a bad creature). So i went to his grave and it was on a different height/cliff-level. So offcourse the hearhling could not walk back home. But the real problem is that he spawned on a place where he would not be able to go to in the first place.
I guess that this is a bug and should be fixed at some point.
(I noted to title as spoiler for this building a wall around your village tactic as i assume that some people would like to figure that out themselves)