Ah I see what you mean. I’ve used that incorrectly for a long time!
When you hit all wall with the scrap, they are destroyed by the impact. This is a feature that’s going to be tweaked in the next release.
The issue as I’ve had it described is that the scrap appears on/under the wall. Still visible but unreachable. This I’m unable to replicate.
Thanks for taking the time to play my little game!
Edit:
Just seen your edit, I’m making the regular scrap much harder to break and more obvious when they do. Hopefully this will clear up any confusion.