QML GridLayout does not emit signal for LayoutDirection, columnSpacing, RowSpacing changes

   GridLayout {
       id: grid
       columns: 2

       columnSpacing: 5
       Text { text: "Three"; font.bold: true; }
       Text { text: "words"; color: "red" }
       Text { text: "in"; font.underline: true }
       Text { text: "a"; font.pixelSize: 20 }
       Text { text: "row"; font.strikeout: true }
       layoutDirection: Qt.RightToLeft

       onColumnsChanged: console.log("no. of columns changed")           // This gets triggered
       onColumnSpacingChanged: console.log("column spacing Changed")    // does not get triggered
       onLayoutDirectionChanged: console.log("Layout Direction Changed")  // does not get triggered
   } 
   Timer
   {
       interval: 500
       running: true
       onTriggered: {
           grid.columnSpacing=20
           grid.layoutDirection=Qt.LeftToRight
           grid.columns =4
       }
   }