World generation folks, help with this?

Hi guys! I'm trying to port a datapack from 1.21.1 to 1.21.5, but I'm getting a lot of errors that look like this. I don't know much about world generation, but any idea on what should I fix? Carver: Failed to parse either. First: Not a string: {"air":["minecraft:cave","minecraft:cave_extra_underground","minecraft:canyon"]}; Second: Failed to parse either. First: Not a json array: {"air":["minecraft:cave","minecraft:cave_extra_underground","minecraft:canyon"]}; Second: Input does not contain a key [type]: MapLike[{"air":["minecraft:cave","minecraft:cave_extra_underground","minecraft:canyon"]}]