The way the Deep Dark biome generates right now, the entirety of a selection of the "mountain" biomes become Deep Dark once you hit the deepslate Y levels. This was supposed to happen in the same way that Lush Caves and Dripstone Caves generate in 3D blobs, not just "If biome == Stony Peaks || Jagged Peaks && y < 0 set biome = Deep Dark", which is what is happening now. The knock-on effect here is broken rare ore generation for mountain biomes. (Similar to the reported issue affecting Lush Caves / Dripstone Caves, but worse as Deep Dark biomes have no ore generation overrides the way the other two cave biomes do.)
Known broken:
Stony Peaks
Jagged Peaks
Known working:
Grove
(I will update the above list as I can validate the various biomes.)
Recommendation:
Either:
Fix Deep Dark generation so that it is not simply a switch for a given biome at a given Y level.
To address the knock-on effect, allow rare ore generation for the original biome that the Deep Dark biome replaced.
Linked issues
duplicates 1
Comments 5
Thank you for your report!
We're tracking this issue in MC-236705, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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No, this is not a duplicate of that issue, though it is related. The major bug here is how the Deep Dark biome generates and replaces all of some of the overworld mountain biomes at a certain Y level. This is not how the biome was described to work, instead it was supposed to work the same as the Lush Caves and Dripstone Caves where specific 3-dimensional blobs of underground areas would have a new biome override, but this is not how the Deep Dark biome is behaving. The knock-on (and arguably the more impactful) effect is that it breaks rare ore generation also. I am updating the title of this bug to reflect the underlying bug better.
All 3 cave biomes behave the same way; there's no overriding biome, or biome mixing anywhere. Both lush caves and dripstone caves also prevent the emerald ore generation.
That might be the way it is supposed to work, but in practice, that is not what is happening. As I described earlier in the ticket, deep dark biome generation is not behaving as described. Instead it is behaving as follows:
if (biome == (stony peaks || jagged peaks)) && y < 0
set biome = deep dark
There may be other mountain biomes where this is happening, but these are the two that I have observed it happening in.
Duplicate of MC-236705.