I have never seen this, I have even left the drone powered up while reviewing footage after landing for over 10 minutes - I have always needed a power cycle on the drone before the last flight data appears on the FF6.
Poorly designed and pretty silly really - I have said this before, they really need to record telemetry data that the drone is sending within FF6 - looking at the SDK, the telemetry sent is pretty much everything that is logged on the flight data, anyway. They should do this for the current flight in progress at least.
