After taking the step from (Android 8 based) 8.8.30 to (Android 9 based) 8.9.20/24 and several days of testing, I can report the following:
What is working better on Android 9?
++ The whole smartphone is a lot faster and the user interface much more fluid than it was on all previous (Android 8 based) versions
++ GPS is also a lot better. GPSTest reports the usage of dual frequency GPS, positioning is more accurate and quite fast
++ The Bluetooth bug is gone. Bluetooth can be switched...
Mi 8 Bugs on Android 9
What is working better on Android 9?
++ The whole smartphone is a lot faster and the user interface much more fluid than it was on all previous (Android 8 based) versions
++ GPS is also a lot better. GPSTest reports the usage of dual frequency GPS, positioning is more accurate and quite fast
++ The Bluetooth bug is gone. Bluetooth can be switched...
Mi 8 Bugs on Android 9