World Generation Datapacks not working for 1.17

So I recently downloaded a datapack that adds the "caves & cliffs" part of the update into Caves & Cliffs, but when I dragged and dropped it into the world datapack folder and opened the server up, normally, the datapack is supposed to add new cave systems, allow azalea leaves to spawn, as well as lush caves, and also expand the world depth/height, but for this, nothing changed.

Woops, didn't realize that the worldgen spawns after you leave the first spawned chunks, sorry!