Some ores do not spawn in deepslate, especially those of gold and redstone, it also happened to me that those without deepslate spawn next to those with deepslate. (in the screenshot at the bottom)
(Sorry for my English, I'm Italian)
Environment
Microsoft Windows 10 Pro (64bit), Java latest version (64bit), Processor: 12X AMD Ryzen 9 3950X, Graphic Card: RTX 3080. RAM 32 GB, Allocated 10GB in JVM ARGUMENTS.
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We're tracking this issue in MC-216737, so this ticket is being resolved and linked as a duplicate.
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