Since MC-214951 was regarding the dark horizon and has been fixed, please do not mark this as a duplicate. Also, please do not mark as a feature request, because ores used to generate normally for superflat, they just don't now, which is a bug. Thank you!
Since deepslate has not been added to superflat at all, it spawns you in negative coordinates. This, for some superflat presets such as Classic Flat, is not a problem. However, it breaks many presets such as Overworld, Snowy Kingdom, and Desert. This causes the ores to fail to generate being that the superflat presets have not been updated to generate deepslate and ores do not generate in stone below y=0.
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Hello!
MC-215423 was resolved as a feature request. Ores do not generate in superflat which is NOT a feature request, therefore this should be reopened.
Duplicate of MC-215423