Before 1.18 we had the shattered savannas with large peaks and floating rock formations creating the perfect spot for a base. Ever since 1.18 these renamed biomes (windswept savanna) are pretty much non existent, litterally swept away by the wind I guess?

Reproducing, just try to find them in newly generated worlds after 1.17

Pretty much the same happened to Ice Spikes and Mushroom fields. Ice Spike shrunken in biome size. Mushroom fields are quit often a shadow in the sea or a tiny 1 chunk island. But the difference here is that they stil show up as a big islands if you're lucky. I doubt this is intentional, finding a shadow in the water after searching for hours.