I notice a similar issue is occurring with the basalt structures in the new nether biomes, where they are cut off by the lava ocean- the basalt pillars in the soul sand valley will just generate the bottom floating atop the lava, and the basalt "piles" in the Basalt Delta will get partially cut off when generated above lava, often leading to just a few blocks of floating basalt.
Aviator
I notice a similar issue is occurring with the basalt structures in the new nether biomes, where they are cut off by the lava ocean- the basalt pillars in the soul sand valley will just generate the bottom floating atop the lava, and the basalt "piles" in the Basalt Delta will get partially cut off when generated above lava, often leading to just a few blocks of floating basalt.