Knocked out thralls don’t actually despawn even if the area re-renders and respawns in Single-Player. I’ve had multiple cases where I’ve KO’ed several NPCs, dragged one home and came back for the next one. The camp has been repopulated, but the KO’ed guys are still sleeping there. (Unless something has changed in recent months.)
Knocked out NPCs can, and often do, actually disappear as soon as you look elsewhere. They pop up back again once you leave a short distance away - not far enough to reload the area, just far enough so as not to see them anymore.
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