It's not uncommon for your new Italian revolver to need some final fitting, no need for a (eek).
That may be the general case. I don't mind easing some rough edges; but, IMHO, the all safety device should work right out of the box. This wasn't a kit gun.
Most shooters well carry a cap and ball on a empty chamber, preferring that to the safety notches/pins.
True, that's why I'd not previously tried to use the notches. I was introducing two new shooters to C & B at the local range. One asked about the notches, and I explained their use. That's when we discovered that the Pietta's didn't work.