I have Plasma 5.9.3. Due to a SUSE packaging error (https://bugzilla.opensuse.org/show_bug.cgi?id=1030559), I wound up with mismatched package-versions: zypper info plasma5-session plasma5-desktop | grep -B 1 Version Name : plasma5-session Version : 5.9.2-1.1 -- Name : plasma5-desktop Version : 5.9.3-2.1 plasma5-session provides the .desktop file that KInfocenter reads to determine the Plasma version, and therefore KInfocenter inappropriately says I have Plasma 5.9.2. KInfoCenter should read this information from a KDE-provided resource, not a distro-provided one. Perhaps `plasmashell --version`?
I have submitted a patch that's available for review at https://phabricator.kde.org/D5471
Closing this since Phabricator comments indicate it's not the right approach. The real issue is with openSUSE. Either the .desktop file shouldn't be re-packaged, or more needs to be done to make sure it's always in sync with the actual Plasma version.