FOSS gamedev and creative worlds

Is it supposed to be that way, or am I missing something here? I am unsure if it's the type of weapon used that matters, or what it's made of, because using a pickaxe or my hand doesn't work.

If the furnace has any fuel or items inside it will just return when you attempt to dig. Is this the case?

There was nothing inside it. It was completely empty. The cracks won't even show up at all when I try to mine it. It's just indestructible.

You need a pick axe to mine the furnace

Guess all I needed was a stone pickaxe, because a wooden one didn't work. Thanks, burli.