Six days ago I tried to fix this bug by flashing my X10II with Android 11 and back to SFOS. Unfortunately without result, the bug is still present.
But I made another very pleasant observation.
With Android 11 I took a long walk with my dog and recorded the track with Osmand. I also installed Magic Earth, and had it calculate a route. I turned location on and off at various locations.
After I flashed SFOS 184.108.40.206 again a day later, I tested location.
I had a GPS fix within 3 - 6 seconds outdoors and a maximum of 40 seconds indoors (my apartment, my office).
GPS setting is device-only.
I have been watching this for 5 days now and was in another city yesterday. Always the same. Sensational.
This could possibly be a workaround for all those who have problems with GPS.