The following just happened in my game:
1) At start-of-turn, a Raider was at minimum hitpoints (meaning that only 1 click is needed to destroy the Raider, assuming sufficient Combat is available; I think this is 2 hitpoints, but I don't have the Raider in front of me anymore to double-check.)
2) I Locked in a selection of planets. The Raider stole 2 units of Production.
3) I clicked on the Raider to destroy it. The 2 Production it stole were NOT returned; the 2 stolen Production died with the Raider.