Helicopters jump in and out of ground effect when near raised platforms, the CFD is not calculating the drop

[REDHER0N]

Examples today during our group flight. First landing with the wind, the CFD visualization completely disapears as one approaches the platform. (Timestamp 1:21:06)
FlightsWithJoel Twitch Oil Rig Landing

Second landing is into the wind, and the CFD behaves much better and only partially get affected by the platform (Timestamp 1:28:17)
FlightsWithJoel Twitch Oil Rig Landing 2