In the attached screenshot you can see an icon is shown beside Gparted and Filelight only and not for others like KDE Partition Manager etc. https://imgur.com/jIn3kDr I think it would be better to show icons for all the suggested applications or for none.
The problem is that these icons are shipped with the applications (that are, according to that menu, not yet installed). To me it looks like a WONTFIX.
Indeed.