Every time when airspeed sensor is activated and you try RTL the plane starts to descent and would hit ground if not switched to manual and saved.
(Use AS sensor) When I set RTL at 50m the plane starts descent with nose pitch 0°
(Don't use AS sensor) When I set RTL at 50m the plane starts climbing with nose pitch 10-15° and goes straight to the target altitude.
If you dont use the airspeed sensor everything is fine. What is causing this? This problem has existed quite long know and many people have written about it.