I think I found a bug in OS 22.214.171.124 concerning iconifying of windows. Actually it's more about un-iconifying them.
- Run a prefs tool, such as "Asl"
- Click the iconify gadget
- Run the "Asl" prefs tool once more
Current behaviour: "Asl" does not un-iconify, but still shows its menu when RMB is pressed
Of course, this only concerns tools that open only one instance, such as all the prefs tools and not those that can be started multiple times (Clock, Shell, etc.).
Please open a ticket for this to be fixed for some future release.