On finishing Young Woodcutter I have an MMA and Nusala each recovering with one normal, barracks-trained recruit thanks to the First Aid skill. I also have Anslem recovering with 15 mercenary recruits.
On finishing the adventure the mercenaries run away as expected, however Anslem returns with 2 recruits and Nusala and the MMA have lost theirs.
It's not a massive problem as the expected troops have returned home, but they're not in the general I would expect them to be. I have noticed this twice now.