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Cave biomes have been removed, as they can generate on the surface. Once I work out how to get them to only generate low down, I'll upload two versions or as a mod.
If you want buried treasure also add "AddBuriedTreasureToOceanBiomes-vx.x.zip" to your datapacks folder.
If you want sheep, pigs, chickens, cows, horses, and donkeys to spawn also add "AddLandMobsToOceanBiomes-vx.x.zip" to your datapacks folder. (they will still require grass, which can be sometimes be found in high caves; try under frozen oceans)
minecraft:plains passive creatures to vanilla ocean biomes.
Only oceans will be generated in the overworld.