For image with snow, I do not know if this generation is intentional, but I like to think that a Snowy Slopes tried generation and gave up.

For the other two image of the tree and caves, the world generation is smooth but it cannot be said for any other generation such as trees and cave systems.

Also after loading an old save to the snapshot, it does remove the bedrock and add deepslate but it does not add any new cave systems, just the stones.

P.S. Just said as before, these images were taken on a world that was created in 1.17 that I backup and loaded in the newest snapshot to check the new world gen smoothing.