I can confirm, SU3 Needles challenge definitely is showing the symptoms of Helicopters jump in and out of ground effect when near raised platforms, the CFD is not calculating the drop.
This is concerning, but the interesting thing is that in free flight or in career mode there is no sign of that bug. I even tried the Needles in free flight, with the 060 at 21 kt with the H125, I have not experienced the effect. Also tried elevated platforms elsewhere with SU3, all was fine.