FWIW, if you're standing on a solid surface, you can quickly clear the malfunction simply by pointing the gun down, and striking the muzzle into the floor. The resulting inertia will carry the offending shell back into the magazine tube. It doesn't take a very hard strike to do this -- basically letting the gun drop from about 4" above ground would reliably put my gun back into working condition, and without so much as a scratch as long as I was on a carpeted surface.
Obviously, this won't work if you're standing in a swamp or something, and I am certainly not suggesting it takes the place of a genuine fix. However, it was something useful I noted while tinkering with the gun trying to figure out how to correct Beretta's mistake.