Hi there,
As of the 9.1.4 update, dawn and dusk stone ores were changed to only drop their shards if mined during the respective time periods (dawn/sunrise and dusk/sunset) and drop cobblestone at other times. This technically wasn't a bug, but an intentional change (which resolved an exploit on earlier versions).
However, I did create the following datapack that may be of interest:
https://www.curseforge.com/minecraft/te ... -ore-dropsThis restores the behaviour found in previous updates, while also preventing the exploit found in those versions.