I don't think this is a bug, because if you could mine it with a silk touch. then basically you could get diamonds or obsidian even with a wooden pickaxe (with silk touch) Then there would be no point in getting better items except to mine them faster.
Rowan Lee Hofmann
I don't think this is a bug, because if you could mine it with a silk touch. then basically you could get diamonds or obsidian even with a wooden pickaxe (with silk touch) Then there would be no point in getting better items except to mine them faster.