The Bug:
Vines can generate floating when intersecting underground structures.
Here is an example:
Version: 1.21.4
World Type: Single Biome, Lush Caves
Seed: -6146314301770596738
Coordinates: /execute in minecraft:overworld run tp @s 5182.52 9.16 2376.87 -399.75 14.89
Steps to Reproduce:
Generate a world with the world type and seed provided above and teleport to the given coordinates.
Look closely at how the vine has generated.
Take note as to whether or not vines can generate floating when intersecting underground structures.
Observed Behavior:
Vines can generate floating.
Expected Behavior:
Vines would not be able to can generate floating.
Linked issues
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Can confirm in 23w03a
Seed: 8587948038190963789
XYZ: 1409 -8 1151
World type: Default
Image:

Confirmed in 23w05a

can confirm in 1.20.3 pre-1,pre-2,sometimes vines floating in trial chambers too

Can confirm in 1.21.3

Confirmed in 1.21.4 prerelease 2
Relates to MC-212146 and MC-227319.