It does seem to be a problem, though. More a problem in general with NPCs not going someplace realistic, but exacerbated by the fact that in this case there's literally no way to retrieve them; you might as well just Ctrl+Y them and take their stuff.
I dropped Khalid during this encounter, but later, i went to this encounter area again except khalid, still at the same place. I don't know how i got here, i was travelling between the south areas, maybe to the mine i can't be sure.
If you get into an ambush encounter in that same area, the party member will still be there. I dropped Kagain and later got into a random encounter and found him still standing there.
This was always a problem in BG 1 since the place you told the npc to leave the party was the place that npc got stuck in. It was fixed in BG 2 by letting you chose if they should stay in place or return to a fixed "home" area which was different for every character usually were you first recruited them.
I dropped Khalid during this encounter, but later, i went to this encounter area again except khalid, still at the same place. I don't know how i got here, i was travelling between the south areas, maybe to the mine i can't be sure.
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So you can redo your party management there.
;P