No channel 4 and 5 output, possible BRD_SAFETY_MASK bug?

Hello, I cannot get any movement on channel 5 and 4, even if channel 1,2,4 and 5 even if these are set in
channel 1= rudder
channel 2= elevator
channel 3= throttle
channel4= flaps
channel5= balance rudders ( ailerons)

The plane is in manual mode.

I am running Arduplane V4.0.9

Balance and flaps does not move, rudder and elevator is working.

Does anyone know what the issue might be?

Parameter file: