I used to fly Bulldogs, powered by a single Lycoming with a CS prop.
On this type, the natural angle of the prop was fully coarse. After the engine started, engine oil pumped the CS unit into fine pitch, or as selected by the pilot. This meant that in the event of an engine failure the prop would feather itself.
The Achilles heel of the system was that the oil pump sat on the back of the engine, directly above the top of the nose oleo strut and very close to it. The significance of this was highlighted when a student pilot at RAF Cosford bounced the aircraft very hard on landing and porpoised a couple of times. The nose oleo was displaced upwards by his efforts and damaged the oil pump. The prop then moved into coarse pitch. Had the pilot stayed on the ground, no problem.
Unfortunately he decided to go around. The engine couldn’t produce much help with the prop in coarse pitch but supplied just enough power for the pilot to fly half a mile beyond the upwind end of the runway whereupon it gave up trying and dumped him unceremoniously into a field. Oops.