Items bound to Quick Keys sometimes do not appear until the Quick Key menu is opened.
Using commit a9d75985. Example: I'll hit 2 to select a magic ring putting the ring icon in my secondary slot. I'll use a charge of the magic ring. Then I'll hit 1 to select a magic weapon, putting the icon in my secondary slot, then hit 2 to select the magic ring again where the slot will change to empty and I cannot select the ring with the 2 key until I hit F1 to display the Quick Keys menu.