There is a issue with the new generation below Y = 0. When I got down all the way to Y = 0 or below, it only generates stone and specific ores.

I suppose the issue is being caused because theres no deepslate layer yet, but its odd otherwise. Its also not generating andesite, diorite, and granite, and the only ores that generate are redstone (as in the image) lapis, diamond, and iron. Also in the image, you can see that water and lava doesn't generate in the ravines below Y = 0.