Sorry, not sure if right sub forum.
With the quest rule that allows setting both A and B button items, the subscreen counter item attribute "show when selected" is broken. It shows the counter when the item is selected for either A or B.
Subscreen Bug
As far as I know, this is intended behavior. The only time this kind of counter should not appear is if the corresponding item (arrow/bomb/super bomb) is not equipped. So, I'm going to say not a bug.
I get that is how it is currently designed to work, but since it doesn't work properly with the quest rule allowing selecting of both A and B items it is broken, ie a bug.
Probably can be fixed easy enough with a modification to the attribute, "display when A selected", and "display when B selected".