My facts after checking, adding to my two cents above.
Two thralls i moved with follow via a maproom from Seper to Jungle,
had returned to there old base in Seper.
Can´t say-remember how many thralls where listed as
gone home in event log.
One male acher III had default clothes -was kitted before- and hovered in the air at his last
moved location at the old base.
So place was as expected.
Thrall two however, a female dancer III was found in default clothes somewhere between seper and the base. So not at all at the location expected.
Pure luck i tryed to pick it up that i found out it was a thrall of mine.
So moved thralls moved with as last move “the follow” command will indeed return to their old “last moved” position, wherever it is on the map.
The two will recieve proper punishment.