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.
To reproduce:
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.