I'm not sure what are these modes at DJI, different from fpv. If you block all these sensors (the bottom ones) and without GPS, the drone drifts and desends without imput. Doesn't hover and doesn't break. No flight modes (video, normal and sport modes are disabled) atti mode overrides all. The smallest joystick imput is immediate and full throttle. Speeds up very quickly. Like when you put the 3 way switch to the most brutal position.What I'm unclear on is your use of "manual" for the behavior when you defeat GPS and VPS on the Neo. Are you saying when you do this it flies in Rate Mode?
I'm skeptical. It would be the first DJI drone to do this, ever.