Lush caves sometimes generate without any cave vines, this makes them look pretty dark and it goes against the theme of the biome + it's pretty ugly
This also happens when the entire cave is located within a lush cave biome so it's not caused by 3d biome ending
Expected behaviour: Lush caves would always generate with cave vines
Observed behaviour: Sometimes lush caves generate only on the ground without any vegetation hanging from the ceiling or the other way around or without any vegetation at all
(note this might be hard to reproduce because of MC-219200)
How to reproduce 21w41a:
Seed: -9235201
/execute in minecraft:overworld run tp @s 174.94 -16.91 -443.44 -1262.83 -2.10
How to reproduce in 1.18 pre4+:
Seed: 47636
Coordinates: 3068 -48 -1112, 3006 -34 -1211, 2951 -53 -1214, -4801 -24 -758[media]
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We found a lush cave with no hanging vegetation in a world on our multi-player server testing 21w41a in survival.
Seed: -202766726466362800
Coordinates: -1821, 55, -1374
Checking the biome at various y levels, we noted that it is lush_caves from 55 to 65, then dark_forest from 66 to 84 (the roof). Biome on the surface is dark_forest too (of course).
So, it would seem that the reason for no cave vines, spore blossoms, etc. in this cave is that most of the cave volume with downward facing block surfaces is not lush_cave biome.
I created a single player world with the same seed to do some more investigation. In it, there is a small region in one corner of the cave that has some hanging moss and cave vines. They span the y=65-66 change to dark_forest biome, presumably due to biome blending.
I wonder if this is really a bug? Is the entirety of a cave volume expected to be lush if some part of it is? It feels like that should be so vertically in caves like the one we found. But how far does that reasoning extend horizontally? Our cave has other caves connected to it via small passages near the top. Should all of that be lush too? Looks to me like 3D biomes raise some interesting design questions.
Update (after another play session):
We dug deeper in the world on the multi-player server and found multiple caves, large and small, with hanging vegetation in the same lush_cave biome.
@unknown This is not caused by the lush cave biome ending for example here the entire cave is located within a lush cave biome and it's still missing vegetation
[media]
I can confirm, I've also seen some lush caves with only the vegetation above, but completly devoid of vegetation on the bottom.