Installing a KDE desktop theme does not seem to change icons even if the theme contains icons. An example is the Diamond theme at https://store.kde.org/p/998883 (which is also in the system addon installer); the theme apparently contains e.g. a different kick off button icon, but after applying the theme the icon stays the same which is true for any other theme.
Is this an expected behaviour? If so, how do I fully apply a theme, including all components (like icons or anything else that might not have been applied)?
(Debian 8.7, KDE 4.14.2)