The bug
When looking at the diagram for ore generation I noticed how emerald would spawn commonly at really high Y levels, such as Y=256 but only in mountains.
After noticing this I decided to load up an Amplified world to see if emerald would spawn as high as it did in the graph.
However, while emerald did spawn as high as it said, it spawned much more rarely, and it would only have 1 ore per vein. If the data of the graph is correct, than it appears that emerald still has kept its original variety, but just spawns higher up.
How to reproduce
Go to a Mountain biome in either a normal or Amplified world
Remove all stone with a command (Such as
/fill)See how small emerald is in comparison.
Linked issues
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Comments 3
I can confirm this. I generated an Amplified world with seed 1 in 21w08b and ran an analysis where I counted the number of ores that spawned in 262,144 chunks. Emerald ores spawned rarely at high elevations in mountain chunks: biome IDs 3 (mountains), 34 (wooded mountains), 131 (gravelly mountains) and 162 (mutated gravelly mountains).
It appears emerald ores are only generating once or twice in each eligible chunk.
Chunks: 262144
Mountain Chunks: 28351
Total Coal Ore: 41593578 (Average: 0.004855)
Total Iron Ore: 17339130 (Average: 0.002024)
Total Emerald Ore: 42455 (Average: 0.000005)
Total Copper Ore: 15157406 (Average: 0.001769)
Total Gold Ore: 9932720 (Average: 0.001159)
Total Lapis Ore: 2494587 (Average: 0.000291)
Total Redstone Ore: 14035437 (Average: 0.001638)
Total Diamond Ore: 2439031 (Average: 0.000285)
There is other information displayed that I have omitted, but the key numbers to note are the following:
Mountain Chunks: 28351 (includes all chunks that contain any mountain biomes in the save files)
Total Emerald Ore: 42455
Average is 1.497 emerald ores per chunk. Should this number really be this low when mountain chunks generate as high as Y=316 in Amplified worlds?
Emerald ore veins always only consist of one block (being the only ore where this is the case).