Can someone explain: RefID of custom NPC vanishes

[trackho]

I use Thanedom of Nightgate , heavily editing it and editing CRF (primarily disabling most of CRF's Nightgate modifications, but only keeping the apothecary). So, in this case, this mod introduces a generic female NPC that acts as a housecarl to 'Thane' Hadring [in the mod, he is made a 'Thane'] but I revert most changes to vanilla but keep the NPC as a wife to Hadring instead.

However, in my discovery in a previous playthrough [that was started with all of this in place], she didn't appear and her refID didn't register at all in the console. I assumed some problems, but didn't think much of it as it's not that big of a deal. I am now at a new playthrough, and I have saved in the CRF Apothecary to check on her. What I find is confounding me. Before I approach the exterior of the Nightgate Inn, the NPC's refID still exists, but just as I cross to what could be the exterior location data of the Nightgate Inn, the refID vanishes. And if I placeatme the refID before entering the exterior of the inn, the NPC loads fine and does her AI package normally and enters the inn as normal, though I have not tested if her refID will persist if the cell is unloaded and in further saves onward.

I had previously checked in the CK to see her ACHR position, adjusting so that she doesn't clip anyone or fall off to the abyss, but as this was done in the previous playthrough where the refID already didn't exist. So now I decided to shift her position to a different interior cell altogether [and changing her sleep package as it was referring to her editor location], which seems to work. As the NPC is generic but a unique, non-respawn, non-persistent actor NPC, it seems weird to me that even the refID mysteriously deletes itself.

Can anyone care to explain?