Qt3D: onEffectChanged and onMaterialChanged events not working in 4.8

import QtQuick 1.1
import Qt3D 1.0
import Qt3D.Shapes 1.0

Viewport {
    width: 640; height: 480
    Cube{
        effect: Effect{
            texture: "http://files.softicons.com/download/application-icons/ruby-programming-icons-by-ahmad-galal/png/512/Qt_Ruby.png"
            onMaterialChanged: console.log("material updated")
            onEffectChanged: console.log("texture updated")
        }
    }
}