1) create a new action
2) fill name and command fields, and click on "icon" button
3) in the new window that appears, on the top dropdown choice for "select icon from", choose "image files"
4) select any icon from the gtk open window and click OK : back to the action creation window, the icon is properly displayed, right, but...
5) click OK : in the actions list, the new action is displayed but without the chosen icon !
6) In Thunar, the icon is also missing in the context menu, when right clicking on an item that belongs to the created action target.