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I open app info.
I press "Disable".
I confirm wanting to "reset to factory version".
I wait for it to uninstall.
The initial "Disable" button is now replaced by an "Enable" button.
You could google "xz1 compact adb uninstall xda"
I don't remember exactly what caused this behaviour (disabled Google apps became enabled again) - but I know that by disabling WhatsNew and some other Xperia built-in 'support' apps this problem went away. Of course, be aware that if you adb uninstall an app that you aftually need then the easiest way to get it back is factory reset.
And thanks to emperor for help.