For whom that's interested and is annoyed that display time is out of sync with atomic network clock time.
Myself don't use 4G network, but WIFI hotspot from phone.
Each time when I opened the GPS test app, time changed and was out of sync by 2 to 4 minutes, also when I forgot to put hotspot on my phone on, after that it was taken the GPS time sync by default after startup,
So first taken my right hotspot network time and changed 30 seconds later to the out of sync GPS time and was also out of sync with my OEM Opel board computer display.
Think this is also a bug, because it should take network time by default and not GPS, only when network not available it should do that, but ones it is taken by GPS it always takes GPS and changing the time regardless if network already sync the time.
With some hassle I could changed that back but needed to be sure that hotspot was always on before starting the car.
Think I found a solution.
Note, I don't use sleepmode, always have a fresh cold start, unit starts up with firmware date and time, 09-01-2023, 12:05:54.
After going in the factory 5544 GPS setting and changing the server SUPL host to supl.google.com, left port on 7275, then next on bottum information page changed satellites to GPS, Glonass, Galileo my problem disappeared.
My unit refreshing time now after a startup within 1 second of atomic clock, with or without hotspot.
The AGPS SUPL was using the Chinese host (supl.qxwz.com) and preferred some Chinese satellites for Glonass and Galileo or my changes did some corrections in de supl.xml in the firmware by changing the host/ preferred satellites.
BTW this AGPS is using server unencrypted without certificates, can't find any certificate in firmware for encrypted connections, so rather Google then the Chinese that follows me