This datapack adds lush and dripstone caves decorators to the default Minecraft world. These generation changes makes it possible to see (in a way) what the caves would look like with the biomes of this update.
As I' have said before, the datapack doesn't change the structure of the world in terms of biomes (which means that it doesn't generate 3D biomes) but makes it possible for certain biomes to generate the structures that you would find in lush or dripstone biomes (stalactites in a desert for example).
The datapack works on both old and new worlds and has two versions, one for worlds with the current height and one for worlds with the new height of 1.18.
Screenshots with the current world height (they have all been taken in the same world):
Screenshots with the 1.18 world height (they have all been taken in the same world):