Natural spawners don't count towards /f top

This may or may not be more trouble than it's worth to fix, but making note of this If you claim land that contains a natural spawner, it doesn't get added to F top. I don't think it should instantly show on F top, as then you could claim land to try to find spawners. One option could be that if the spawner spawns a mob (player in range), then the spawner shows on F top as the player has "discovered" the spawner. on a related note, natural spawners have different properties than placed spawners. Natural spawners seem to spawn mobs with AI, while placed spawners spawn mobs with no AI.