It seems to be a problem with the vine generation as all holes are filled with vines. They generate exclusively at y=64. May be the cause of the problem of the low framerate as described in MC-125283.
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MC-125437
Strange holes/vines generating under Jungle Biome
Resolved
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1
Benedict Böttger
(Unassigned)
Unconfirmed
Minecraft 18w07a
Retrieved