[HOW TO] Flash a custom ROM on FP3 with GSI

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Maybe “uninstalling” the unnecessary priv apps instead of disabling them could be the better way. In the Thread Google apps keep reinstalling someone mentioned that it would be better to use

adb shell pm uninstall -k --user 0 com.qualcomm.qti.qms.service.telemtry
adb shell pm uninstall -k --user 0 com.qualcomm.qti.qms.service.connectionsecurity
adb shell pm uninstall -k --user 0 com.qualcomm.qti.optinoverlay
adb shell pm uninstall -k --user 0 com.orange.update
adb shell pm uninstall -k --user 0 com.orange.aura.oobe

instead of

adb shell pm disable-user --user 0 com.qualcomm.qti.qms.service.telemetry
adb shell pm disable-user --user 0 com.qualcomm.qti.qms.service.connectionsecurity
adb shell pm disable-user --user 0 com.qualcomm.qti.optinoverlay
adb shell pm disable-user --user 0 com.orange.update
adb shell pm disable-user --user 0 com.orange.aura.oobe

for preventing uncontrolled reactivating of those apps. But maybe this is a stock rom problem only.
By the way: it should be ok to remove com.qualcomm.qti.qms.service.trustzoneaccess as well:

adb shell pm disable-user --user 0 com.qualcomm.qti.qms.service.trustzoneaccess

You should not disable com.qualcomm.timeservice.