Has anybody found out Prefab Spawner blocks in Worldgen v2?

I'm making an attempt to make procedurally generated dungeons utilizing WorldGen v2

Factor is : I can't discover any data on PrefabSpawner they usually're being kinda wonky. I'm unsure if I'm doing one thing mistaken or in the event that they're simply not working correctly.

As an alternative of appearing like a series of Prefab Spawns, they begin the chain after which set off each potential spawner block within the folder as an alternative of simply choosing the one from the prefab it's gonna spawn.

Can somebody please clarify them to me or level to the reason?