This is probably a result of it not recognizing the KDE keyword in the .desktop files any more I would guess.
Source RPM: plasma-workspace-5.7.2-3.mga6.src.rpm => plasma-desktop-5.7.2-1.mga6.src.rpm
Blocks: (none) => 17523
Already reported *** This bug has been marked as a duplicate of bug 18360 ***
Status: NEW => RESOLVEDCC: (none) => mageiaResolution: (none) => DUPLICATE