Caves generation is not proper and many blocks are from nether biome to caves generation

Hi! Today when i was playing Minecraft in this seed "Warden" after some times in creative mode i go to depths of cave generation i see a very large cave generation and it is the largest cave generation in Minecraft so first i see a floating Amethyst Geode okay but then i see a bone block that is always found in the soul sand valley and bone block are always a part of soul sand valley but they were floating in open cave generation there is a attach i have post in this issue so i just wanted to say that open cave generation is having floating bone blocks and floating amethyst so please resolve this issue