Thank you, but... I feel so bad that I must to say that T_T, but it's not exactly what I wanted ^^' So sorry if I was no clear enough (english isn't my first language, which not makes that easier). I tried to have walls with ores on it, like we draw the walls, then for example coal ore spawn on the wall (it's visible, not under the wall), and during digging on that wall we are destroying that ore too. Like...in Minecraft, I think?
I would be very grateful if this could be implemented, but I cannot demand it either. Thank you so much for your time!
Btw I think this can be useful too, though, so thank you! We could make something like hidden boxes or chests that can be broken for example - that's nice.