The bug
When you create a world buffet and you selected as world "Deep Frozen Ocean" with the generator of the world "Floating Islands" of the floating islands are generated with trees, everywhere with icebergs on the surface of rivers of water and lava and structures on the surface.
When you select the world generator "Surface" everything is normal.
How to reproduce
Create a buffet world generation
Select as biome "Deep Frozen Ocean"
Select as the world generator "Floating Islands"
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Comments 6
Just to add some information to this post: The "flooded" caves and the "smooth" icebergs generate floating due to the fact that they are ignoring the sea level of the area (I would expect the flooded caves to generate at level with the sea level, but since there is no sea, they should generate without water. For the "smooth" icebergs, I would say they should generate at a consistent level with the "rough" icebergs).
Another thing is that "rough" icebergs generate stuck to the void, but many other structures like ruins, shipwrecks, igloos, jungle temples, and any other structure that usually generates on the sea/ground will treat the void as if it were the ground (except woodland mansions), so the structures may generate in the void and be cut off at a certain point.
For this post, I would say that this falls under the first problem I mentioned, since the screenshots show mostly "smooth" icebergs and "flooded" caves generating in mid-air. The problem with "rough" icebergs, shipwrecks, ruins, jungle temples, and igloos generating attached to the void is a different problem.
(In case you don't know the difference between "smooth" and "rough" icebergs, the second screenshot shows the more random "rough" iceberg, and the fifth screenshot shows the "smooth" icebergs.)
Can also confirm for nether buffet worlds, with the only difference being that "rough" icebergs generate at Y:64 instead of at the lowest sea level.
In 20w06a it it solved. But there are some"ice spikes" everywhere and there is an water cube with ocean monument.
I also cannot reproduce in 1.16.4 pre-release 1 @unknown The ocean monument water might just be part of the structure for where the guardians can spawn so I believe that is intentional
It is quite intentional, just because you chose the Ender generator (which I prefer to call) instead of the normal one XD. The Ender generator is supposed to be generating everything on the model of the floating islands in the End, right? So it's not surprising at all. 😃