The new texture in not applied to all ores

Are you using any resource packs?

I don't have resource packs. I just downloaded the latest snapshot and created a new world.

Try reinstalling the game and see if the issue persists.

This happens because you are using Programmer Art resource pack

Yes. And programmer art is unsupported (MC-169889)

Thanks guys the issue was from Programmer Art resource pack. Is this pack automatically installed, because i didn't install that pack.