Mining iron ore with a golden pickaxe with the silk touch enchantment causes the iron ore drop to vanish. Upon using a normal iron pickaxe, the iron ore drop appears
Not a bug, this is simply Minecraft functionality. This would be a feature request you would have to forward to Mojang. Golden Pickaxes do not work on Iron Ore in general. https://bugs.mojang.com/browse/MC-202919
Yeah I found out the same thing Johndom. It's useless on iron and emerald ores. Same thing happened to me with emerald ores too. Disappeared as well.