Bug in popupContextualMenu?

Hi all, I have experienced a weird behavior in popuContextualMenu where the value of the returned S_selection variable does not match what was in the menu's custom string in the case where an exclamation point is included in the menu list.

Example non-working code below: if the user clicks on a trace, a single-item popup menu displays, but the stringswitch statement returns nothing.

function fitContextMenuHook(hs)
  STRUCT WMWinHookStruct &hs
  
  variable ret=0
  strswitch(hs.eventName)
    case "mousedown":
      Variable isContextualMenu = hs.eventMod %& 0x10 //did the usr right click?
      if(!isContextualMenu)
        break //do nothing if it was a left click
      endif
      string clickedTraceName = tracefrompixel(hs.mouseLoc.h, hs.mouseLoc.v,"")
      print clickedTraceName
      if (strlen(clickedTraceName)) //if there was no trace evaluates to zero (ie false)
      popupContextualMenu/C=(hs.mouseLoc.h, hs.mouseLoc.v) "Fit me!;"
      print s_selection
      StrSwitch(S_selection)
        case "Fit me!": ///////DOES NOT RETURN TRUE WHEN USER SELECTS FROM THE SINGLE-ITEM MENU
          print "fit me baby one more time"
          break
      endswitch
      ret=1
      endif
      break
  endswitch
  return ret
end

However, the following code works:

function fitContextMenuHook(hs)
  STRUCT WMWinHookStruct &hs
  
  variable ret=0
  strswitch(hs.eventName)
    case "mousedown":
      Variable isContextualMenu = hs.eventMod %& 0x10 //did the usr right click?
      if(!isContextualMenu)
        break //do nothing if it was a left click
      endif
      string clickedTraceName = tracefrompixel(hs.mouseLoc.h, hs.mouseLoc.v,"")
      print clickedTraceName
      if (strlen(clickedTraceName)) //if there was no trace evaluates to zero (ie false)
      popupContextualMenu/C=(hs.mouseLoc.h, hs.mouseLoc.v) "Fit me!;"
      print s_selection
      StrSwitch(S_selection)
        case "Fit me":  ///THIS RETURNS TRUE
          print "fit me baby one more time"
          break
      endswitch
      ret=1
      endif
      break
  endswitch
  return ret
end

So it seems that while the popup menu contains just one item, the string "Fit me!", s_selection seems to return "Fit me", without the exclamation point.

Is this a bug? I haven't tested it with other non alphanumeric variables.