Q Designer: inactive QPalette color values not stored correctly

When setting "Inactive" colors in the palette for a label or form via QtCreator only default values are stored in the ui-File. This leads to ugly/unexpected dialogs or windows when they loose focus.

As can be seen on palette screenshot colors should be light-green (143, 240, 164) and light-blue (153, 193, 164) respectively.

Snippet of UI file content:

        <inactive>
         <colorrole role="WindowText">
          <brush brushstyle="SolidPattern">
           <color alpha="255">
            <red>0</red>
            <green>0</green>
            <blue>0</blue>
           </color>
          </brush>
         </colorrole>
         <colorrole role="Window">
          <brush brushstyle="SolidPattern">
           <color alpha="255">
            <red>239</red>
            <green>239</green>
            <blue>239</blue>
           </color>
          </brush>
         </colorrole>
        </inactive>