The Bug:
Near the top of the nether at y level 121, cave carvers always get cut off, resulting in caves and ravines having flat ceilings.
Here is an example:
Version: 1.19.3
Seed: 1692907036
Coordinates: /execute in minecraft:the_nether run tp @s -207.04 114.23 412.72 105.38 -46.64
Steps to Reproduce:
Generate a world with the seed provided above and teleport to the given coordinates.
Look closely at the ceiling of the cave/ravine.
Take note as to whether or not caves and ravines near the nether roof have flat ceilings.
Observed Behavior:
Caves and ravines near the nether roof have flat ceilings.
Expected Behavior:
Caves and ravines near the nether roof would not have flat ceilings.
Linked issues
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Affects 21w42a

Affects 1.18 Pre-1

Affects 1.18 Pre-6
Can confirm in 1.19.
[media]Version: 1.19
Seed: -7904429713016255202
Coordinates: /execute in minecraft:the_nether run tp @s 36.45 109.84 84.07 -109.60 -44.19
This ticket is actually a duplicate of MC-129569.
Can confirm.
Also, kind of unrelated, they appear to generate in different places as before, since I created the same seed and went to the nether both in 1.17.1 and 21w41a and there were caves in the snapshot where in the release there weren't any