SUMMARY The applet only displays fe80:: and fd00:: addresses in the details page, even though /org/freedesktop/NetworkManager/IP6Config/3 AddressData property lists all of them. SOFTWARE/OS VERSIONS Operating System: Gentoo Linux 2.18 KDE Plasma Version: 6.4.5 KDE Frameworks Version: 6.18.0 Qt Version: 6.9.2 Kernel Version: 6.16.8-gentoo (64-bit)
For me it doesn't show the fe80 address but one starting with 2a02 Looking at the code it It just picks the first one https://invent.kde.org/plasma/plasma-nm/-/blob/master/libs/models/networkmodelitem.cpp#L617