I can see a lot of floating vines with a wrong rotation. Tree .nbt has long weeping vines attached to its leaves and logs, addded in configured feature by this line:
"place_from_nbt": ["minecraft:dark_oak_wood", "minecraft:dark_oak_leaves", "minecraft:vine", "minecraft:cave_vines", "minecraft:cave_vines_plant"]
Unfortunatelly, long vines (not the single-block ones in the tree decorator) and other stuff cannot be generated during the biome generation as a separate feature, they don't see the tree, only the land=( I have to use this method.