I found stone ores under y=0 that I think replaced tuff exept lapis that was every time stone ore, and they even was in deepslate vein of ores, just make when ores are repalcing tuff, make them deepslate ores like you did with deepslate.

Check that when you put in repeating command block that command execute as @p at @s run fill ~4 ~4 ~4 ~-4 ~-4 ~-4 air replace #minecraft:base_stone_overworld