Tried it again and it actually works in both the tutorial and main game. I think I was too stupid to properly compare before and after of my point status. So that's on me ;) I think in the first playthrough I wasted my bomb on the upper minerals and there I only got one of the blocks (as the others have too much health) and that's part of why I didn't notice.
Nice, next time more bomb usage from my side. :D