Upgrading to 15.3 reinstalled default applications

I upgraded an openSUSE box from 15.2 to 15.3. Previous upgrades worked as I expected: installed software was upgraded but nothing not needed was installed. This upgrade however re-installed openSUSE's default software (default web browser, default mail client, default music and video players, etc.). I'll uninstall them, but what might I have done wrong during the upgrade that could have caused that? I ask because I have several other boxes to upgrade and I'd prefer to learn from my mistake before continuing.

What I did to upgrade was what what I always do, follow the offline upgrade instructions at https://en.opensuse.org/SDB:Offline_upgrade. Perhaps there is some new option in the 15.3 upgrade process that I overlooked in my enthusiasm to upgrade?