Golf VI Cabrio Warning message Fuel tank appears only once

Hi. My girlfriend noticed that on her Golf VI cabrio, when the tank is on reserve, the warning message "please fill up" appears and the car only beeps once. After restarting the car, it doesn't beep again.

It only beeps once when the tank is on reserve. If you drive a bit and then turn it off and drive again, it doesn't beep again, which is how it works with my Passat, where it beeps every time I restart it.



Is this normal for the Golf VI?