The Bug:

Cave vines can sometimes generate hanging on cobwebs.

Steps to Reproduce:

• Enter any of the following seeds and coordinates.

• Version: 21w38a
  World Type: Single Biome, Lush Caves
  Seed: 8009750494097954235
  Coordinates: /execute in minecraft:overworld run tp @s -1146.70 6.71 7693.70 -870.90 17.09

• Mineshaft:
  ==========
  Caves & Cliffs 1.17.1 Datapack Preview
  World Type: Single Biome, Lush Caves
  Seed: 8653174682937665581
  Coordinates: /execute in minecraft:overworld run tp @s -8917.88 -51.00 -2172.71 -48.23 2.29

• Stronghold:
  ===========
  Caves & Cliffs 1.17.1 Datapack Preview
  World Type: Single Biome, Lush Caves
  Seed: -1290361904797768774
  Coordinates: /execute in minecraft:overworld run tp @s 1713.32 -17.00 38.90 -5.67 4.26

Observed Behavior:

Cave vines can sometimes generate hanging on cobwebs.

Expected Behavior:

Cave vines would not be able to generate hanging on cobwebs.