nothing happens, because you can fill this in 1 hour before you go into the airplane while you sit in the airport of departure.
make a print screen of the QR code and finished.
previous you filled in the paper one and did that in the airplane.
now you can do it on your computer.
and a bit later there will be an app where you can store all your info, only need to update the arrival and departure date and finished.
why make so much fuzz about something so simple