A large number of dungeon interiors that do not have the 'TR_' prefix in the name are missing NPCs or creatures. There seems to be a large overlap with the ones I found have path grid issues, reported here: https://www.tamriel-rebuilt.org/bugtracker/path-grid-issues-roth-roryn-i.... Listed here are the ones I found that I don't know are NPC'd in quest claims. In most cases, I don't know the intended use, so that needs to be looked up elsewhere. It is possible that some are left intentionally empty.

• Assinad (including Hidden Dwelling)

• Barunal (only has a single rat, not motivated by the size of the interior)

• Berendas Ancestral Tomb

• Dunusi (check merge notes from Hlaalu questline)

• Elandad

• Issurnawia Mine (the lower cavern also only has a single NPC)

• Kitmunad

• Kumaralk

• Litu-Dur Mine

• Lukhalutun (the well of spirits has a single NPC, but that's it)

• Maatumassu

• Marsud

• Mvelthngth-Schel (both interiors)

• Puzur-Attin Egg Mine

• Sadrapit Mine

• Tomaril Ancestral Tomb

• Urussabi