I've done some testing on this and can't get any reclamations to happen on a different planet. However, I can see zombie guardians reclaiming my ships as non-zombies, so a little WTF moment there. Maybe this is related to the recent changes - could the "splash" reclamation be causing this?
I'm going to post the save so you can check it out.
1) Turn off Doomshroom Cannons on Karplusan Forest
2) Watch our fleetball on Tundra get destroyed/reclaimed
The ships that come through the wormhole don't have reclamation on them, but I tried tractoring in the engine-dead ships which were obviously hit by a lot of mushrooms, and also tried using normal parasites, but no off-panet reclamations, as I said before.