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MC-218676

Lush cave blocks do not generate directly below decorative blocks

Lush cave blocks (moss blocks and clay) do not generate directly below decorative blocks like cave vines and glow lichen in the lush caves biome and are replaced with stone or deepslate, depending on where the cave is generated. Does not happen when there is air between the decorative block and the block below. The world generator seems to be treating these decorative blocks as solid blocks, and therefore not generating the appropriate blocks in the spot it thinks has a solid block above.

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21w10a
Seed: 9198743757370309694

[media]

Teleport command:
/execute in minecraft:overworld run tp @s -333.04 -42.32 -444.84 -124.84 23.55

Other occurrences:
/execute in minecraft:overworld run tp @s -329.70 -40.82 -477.41 -248.74 37.50
/execute in minecraft:overworld run tp @s -272.54 -40.26 -425.68 142.61 21.00

Clay:
/execute in minecraft:overworld run tp @s -1178.24 24.87 -232.89 -2896.59 36.60
/execute in minecraft:overworld run tp @s -1373.64 15.13 -220.83 -3644.65 39.15
/execute in minecraft:overworld run tp @s -1640.52 -44.85 -164.05 -3497.99 43.20

Glow lichen:
/execute in minecraft:overworld run tp @s -52.42 -39.93 -842.74 -254.61 21.90
/execute in minecraft:overworld run tp @s -152.38 -26.07 -517.83 -348.35 27.30
/execute in minecraft:overworld run tp @s 18.25 -10.36 83.66 -832.57 31.20

Clay:
/execute in minecraft:overworld run tp @s -1226.15 -19.39 445.61 -3539.91 53.55
/execute in minecraft:overworld run tp @s -1200.78 -26.17 795.93 -4173.67 34.35

21w11a
Seed: 9198743757370309694

[media]

Teleport command:
/execute in minecraft:overworld run tp @s -106.47 -30.31 -518.82 -519.21 33.58

This was fixed in 21w40a as it was caused by MC-237950

I also cannot reproduce after 21w40a

This is still an issue in my testing. As far as I can see, the two issues are hardly related.

21w40a, Single biome generator, Seed: 3916199241846768006
/execute in minecraft:overworld run tp @s -165.83 -40.73 380.99 -592.78 40.05
/execute in minecraft:overworld run tp @s -210.53 -39.94 347.08 -426.14 37.65

21w43a, Single biome generator, Seed: 7420518306090033422
/execute in minecraft:overworld run tp @s -347.58 -32.22 -4.60 -488.53 41.55
/execute in minecraft:overworld run tp @s -437.31 -30.72 32.77 -326.55 50.25
/execute in minecraft:overworld run tp @s -481.30 0.78 36.58 -94.95 45.30

A couple of interesting cases I've found with cave vines:
/execute in minecraft:overworld run tp @s -539.15 -29.17 -60.96 42.30 58.20
/execute in minecraft:overworld run tp @s -560.05 -39.67 -88.42 -92.40 52.80

user-d0031

(Unassigned)

Confirmed

Gameplay

Low

World generation

21w10a, 21w11a, 21w13a, 21w14a, 21w19a, 1.17 Pre-release 2, 1.17, 1.17.1 Release Candidate 1, 1.17.1, 21w43a

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