B-screw adjustment in a derailleur with a spring in the upper pivot (Shimano RD-5800)
Well, I have removed the derailleur from the hanger, put the B-screw half-way in, reattached the rear derailleur, and the noise of a maladjusted B-screw appears.

I have followed ParkTool guidelines, and now it is properly adjusted: 1/4 of turn from the cassette/upper pulley rubbing position.