How to not let structures spawn in the void?

I was playing around with the worldgen datapack called Ecospherical Expansion and the floating islands presets. My problem is though that structures still spawn in the void. For example, villages and dungeons still generate at the bottom of the void. My question: Is there a way to make these structures not spawn in the void? Can that also be applied to structures in general, for example, those from mods? I know close to nothing about worldgen datapacking, that's why I'm asking.