I created a mob spawner for an Iron Golem farm using the command "/setblock minecraft:spawner{SpawnData:{id:"minecraft:iron_golem"}} ". The spawner mostly works normally, however, it won't spawn them above air or water, only on a block. This is in contrast to other mobs like Zombies or spiders, which spawners can spawn in midair. This has limited my Iron Golem farm options and made them less efficient, as the spawner will only work at all up to two blocks above the floor, and only one level of potential spawning areas will be valid. In the screenshot, the Iron Golems are in the only valid spawning locations. They will never spawn in the water or above it.