Moreso than if you just overrun the runway. Any maneuver that brings the throttle to idle, for instance a hammerhead or stall turn, you bring the throttle to idle just before you perform the hammerhead, then leave it there for a few moments. Also, in a loop, at the top of the loop, we normally go to idle or close to it. Any time the aircraft is actually poing down, we reduce the throttle, sometimes to idle, and a loss of engine at that point can be a problem.

All the reason to practice your emergency procedures.. what to do in case of a dead-stick.... well, land of course, but getting it to a point where you can land safely is the practice part. And, of course, losing an engine is the object of that drill.

Having a good idling engine is a good thing and is all part of the setup and pre-flight. You start it up, then check the idle, then check the transition, then the HS mixture, and so on.

CGr.