Dark Brotherhood Assassin (and other scripted NPCs?) spawns beneath/inside solid objects
Dark Brotherhood assassins attacking the player while they rest do not seem to respect landscape or objects behind the player; resting by the rocks below the silt strider in Seyda Neen is a good place to reproduce without too much difficulty; face toward Seyda Neen and backed against the cliff.
(RM-1384 from redmine: created on 2014-06-03 by Kyle Willey, , closed on 2016-02-29 by scrawl ., relates #2925 (closed), relates #3046 (closed), relates #2515 (closed), duplicates #1771 (closed))