Biomes were given y axis support in recent updates, as preparation for 1.16 and beyond. Currently, examples of y level biomes are near non-existent and for almost all cases, biomes still take up the entire chunk. The few cases we've discovered are only a few clusters of blocks, rather than the bounding boxes of biomes.
Examples, using the seed -9081470300596806506, tested in spectator mode.
The vast majority of nether terrain will only indicate one biome in the F3 menu for the whole y axis, even if those biome is not present above/below a certain height.
x3, z1337 - flying up and down between y80 and y120 will display several examples of these biome changes, despite little to no variance in the blocks present.
x13, z1396 - Some of the most notable overlap, biome labels and fog colours change every few blocks between y0 and y200, with the effect most notable between y30-60 and above the nether ceiling.
In the above examples it's also possible to fly above the nether ceiling toward y200 and observe these biome changes, despite no blocks from those biomes being present.
A fix for this is not only important for the Nether update but Cool, Awesome, Very Exciting updates in the future. Tested on both multiplayer and singleplayer, with multiple clients.
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I'm inclined to disagree - these y level biomes examples are so rare it took a team of us over an hour to find an example, and even then certainly doesn't align with any observable edges for biomes like you'd typically see in any other biome in the game. Even if they intentionally fuzz, the examples listed above show no real pattern to their placement, and certainly should not be random blocks, or groups of blocks within other biomes. We've heard that vertical biomes are not finished, and I would strongly argue that until proven otherwise, this is a valid bug report to track issues with an incomplete feature.
I think they aren't doing the cave update this time, mostly for the nether biome. It's actually quite often in the nether.
I didn't state that this was a cave update. The issue aims to highlight that the vast majority of new nether terrain does not seem to have y level biomes, and the parts that do, don't seem to have correct boundings.
@nighter @[[Mojang] Adrian Östergård|https://bugs.mojang.com/secure/ViewProfile.jspa?name=nighter] could we get some clarification as to why this is a 'won't fix'? If I'm honest, without this being fixed it seems like y level biomes may as well not exist, for all the difference it makes to the game.
Biomes intentionally fuzz, including on the Y axis (in the nether). I think this is intentional.