Well...
I was a bit reckless with my enthusiasm, declaring that button_2D-3D works fine and as independent ux in my deafult Luna.
2D-3D is functioning. Sat's status is displayed well. Altitude... stuck on 0 m'.
And so I removed it. Why? I am of the opinion that, if the smallest and simplest UX does not work perfectly and fully, then, it will get something or cause something.