I can use LNR to load natives, but cannot for the life of me find a scenario that will allow UNR to unload them. I've found other posts with players having the same issue, but no solutions. I've created two test games using Jupiter v1.07a, default shiplist, and no other addons. I've used DOS Planets to create the TRNs in one test game and WinPlan32 in the other. I've tried both owned and unowned planets. I've tried towing the ship that is set to LNR so the mass doesn't change at all due to fuel consumption. As far as I can tell UNR in v1.07a doesn't work.
I've set a ship to LNR and each turn it loads a new set of natives. No message is ever received as to what happens to the natives that were already onboard. I can remove all but 1 native clan from a planet.