I was running the weekly bonus event at the Red Bull Ring the other day and saw that there's a fly-by of three airplanes; they look like the Red Bull Air Race aircraft.
I tried another shot, this time with a slow shutter speed to blur the props, but what I got had no airplanes!
If I put my shutter speed back to the default, the aircraft re-appear, but quite a ways back in their own smoke!
So that's a bit weird... I set my shutter to another speed and retried, not moving the camera, no other changes, and the airplanes are still there, but still well back in the smoke.
If I exit photo mode and let the replay resume, I can see the airplanes move up through the smoke back to their correct position. When I try again from another angle, as soon as a try a slower-than-default shutter speed, the aircraft always either disappear or appear that distance behind where they should be.