It appears cave vines can generate attached to any block as long as it generated before it in the generation stage. This can lead to cave vines growing from cobwebs and potentially other transparent blocks.
Example:
Seed: -8508883206669806165 (lush caves simgle biome world)
/execute in minecraft:overworld run tp @s -39.93 -43.00 252.42 -812.72 25.59
This might be hard to reproduce because of MC-219200
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I found that depending on from which side I approach this area this cave spider spawner generates differently and its so inconsistant that after creating 20 worlds I wasn't able to reproduce this. I assume this is the result of MC-219200
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We're tracking this issue in MC-218817, so this ticket is being resolved and linked as a duplicate.
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Cannot reproduce.