Link to forum generated based on data from appdata KDE::forum is broken
The wiki page states:
The <value key="KDE::forum"/> tag is an optional tag containing the sub forum id in forum.kde.org.
but the code seems to expect a full URL. See
https://invent.kde.org/websites/kde-org-applications/-/blob/master/src/Model/AppData.php#L482
(fix might be to just do the same handling as done for X-KDE-Forum
)