Disposable e-cigarette disposed of in the masonry

The garbage will be covered up later by the garden landscaper, then everyone can convince themselves that everything is fine ;)

I would also rather avoid making a loud scene with bricklayers. Unless you have the stature of Markus Rühl, they probably won't take you seriously. And who knows how neatly they will work afterwards. I would complain about it in writing to the [GU/Bauträger] and call it a day. Maybe he even has a good connection with the bricklayers and can solve the problem.