Thanks, for some reason in my case (on a stable channel P4a) I found that skipping a minor
weekly update, and installing another one, will cause 2 updates and 2 reboots meaning it will
prefer to do 2 deltas instead of a full one.
I personally prefer to apply only the monthly Android security patch, rather the weekly GOS releases.
However it's not an option to choose such a release channel, so I stick with "extra-stable" in my case.