Post-combat NPCs do not return to unloaded cells
Following up from observations in #5262 (closed), I began another test at Dren plantation. By stealing a low-value item at the docks and aggroing nearby warrior Mavus Ules, I was able to lead him to Pelagiad and pay my bounty to a guard, ending combat. In OpenMW, he will remain in Pelagiad forever. In Morrowind, he will actually attempt to path back to Dren plantation, and can do so successfully if you disable collision or impassable objects; see screen 1. He will also be moved instantly to his original position by waiting around 24 hours.
This was repeated again, this time taking him to Vivec Temple canton; see screen 2. Again he began to path back to Dren Plantation, though in this case I simply used the wait function rather than witness the trek back. He reappeared at the plantation again without issue.