The prop was not turning at the time of the crash
If the prop was not turning it would be in the feathered position, obviously not the case in the photo. From the flight manual of an aircraft with the same engine.
The propeller utilizes oil pressure which opposes the force of springs and counter-weights to obtain correct pitch for the engine load. Oil pressure from the propeller governor drives the blades toward low pitch (increases RPM) while the springs and counterweights drive the blades toward high pitch (decreasing RPM).