So to be honest I’m not really sure if this is a bug or not. My cousin and I started a world together in 1.17. We’ve been having a really tough time finding diamonds. We went into creative mode in that same seed of the world. We also went into other seeds to see if it was just our world but it seems that diamond ore doesn’t generate very much in any world. We did find a few diamonds while looking in creative but not nearly as much as we’d find in previous versions. It also seems that you don’t get as many diamonds per vein as you would get in previous versions. In 1.16 and previous versions we’ve found lots of diamonds. I want to know if this is a bug and if it is, please fix it because we’ve mined for hours at y=11 and haven’t found a single diamond.