Now with sailfish flashed on Android 13 with 12_4.19.v2a blobs according to this setup cited here:
The no sound after GPS use is at least less persistent, so that it is not reproducible anymore.
I will test if it is completely gone and if it will be at least absent for the next 30 days.
Currently, audio works flawlessly after GPS use with the Sailfish on top of ‘Android 13 + 12_4.19v2a blobs’ route, but it needs more testing for robust evaluation.
For my non technical expert mind this is somewhat strange: that the Android fundament on which Sailfish is flashed, has such an impact.
Does this imply that Sailfish 5 on the upcoming Jolla C2 device will not suffer these strange Xperia specific and annoying bugs?
Anyway, deep respect to wetab73 and others who paved the way for this unexpected findings.