the redstone generation is wrong according to this image. Normally an ore from any Overworld mineral is generated in its deepslate version if it is in a deepslate bubble, but in this case the redstone was bugged and was not generated in its deepslate version.
[media]Attachments
Comments 2
Relates to MC-227789
You have optifine on, invalid.
Also i'm pretty sure that the deepslate generation isn't neccessarily smooth, you can see more stone in the picture so it's possible that regular stone would've been there anyway.