I think that makes it more likely it had a soft landing. Loses propulsion systems and the computer continues to keep the craft level and in control as long as possible which means gliding right up to the point the collision detection pulls up for a nice gentle belly landing.

edit: And to continue the baseless speculation, I think the drone has a transponder on a timer that is set to go off in 72 hours. Some hidden Iranian installation is going to light up like Las Vegas.