The three cultists associated with the random wilderness encounter quest (DLC2WE09) that starts the Dragonborn questline fail to clean up when they're intended to. I realize this was supposed to have been fixed by the patch back in 2013 (see
Issue #11926). If I understand the details in that ticket correctly the encounter quest was supposed to be shut down once the note has been read and DLC2MQ01 reaches stage 10. This never happened in my game and the trigger for the encounter spawn point remained broken and unable to load another encounter. It finally shut down after killing Miraak and completing the main Dragonborn questline, but it isn't supposed to take that long unless something's changed over the years.
Prior to completing the questline, the console shows that DLC2WE09 is running and is at stage 10. From what I can see, only 2 of the 11 aliases had been set to "NONE' (assuming they were ever set to begin with). I'd like to provide the entire console output, but it takes forever to type all of it up in Notepad and paste it here. Below is part of what is being shown.
- 11 Aliases for quest 'DLC2WE09' (040331C0) -
REF 'Trigger' -> '' (000D18D5)
LOC 'myHoldLocation -> '' (0001676C)
LOC 'myHoldContested -> NONE
LOC 'myHoldImperial -> NONE
LOC 'myHoldSons -> '' (0001676C)
REF 'TravelMarker1' -> '' (000D18D6)
REF 'TravelMarker2' -> '' (000D18D7)
REF 'Actor1' -> '' (FF001F3C)
REF 'Actor2' -> '' (FF001EE7)
REF 'Actor3' -> '' (FF001E8B)
REF 'NoteInitial' -> '' (FF001E17)