With the Caves and Cliffs Part II release being tomorrow, terrain blending must be smoothed as much as possible. Floating water, leaves and even broken trees have been found on my 1.17.41 world that was converted to experimental. 

Update: Terrain in the same world in the new update has been majorly improved. I only found a few broken trees in a swamp biome, but other than that there are no issues. I also noticed that the sea is much, much bigger, and a lot of land was deleted and replaced with water. No floating water or anything.