So I got curious and started a new game and instead of claiming the second ship once located, I terraformed the planet. Also checked the other planets in the system and it didn't respawn on any of them.. . . Soo you might need to block that cause it worked.
Logically people shouldn't do this but you know, idiots are infinite in this universe.
As I said, I started a new game specifically just to test this so I didn't loose any progress.