I have found that vines spawn underground at the moment. This only occurs in Jungle biomes to my knowledge. It also only happens at y=64, though.
See the screenshot for more info
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bemoty
MC-126542
Vines generate underground in Jungle biomes
Resolved
Duplicate
0
bemoty
James Kitching
(Unassigned)
Unconfirmed
vines, world-generation
Minecraft 18w09a
Retrieved
Thank you for your report!
However, this issue is a Duplicate of MC-124953.
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