QObjectPicker::clicked() signal is not emitted immediately if QRenderSettings::renderPolicy is set to OnDemand

I'm using the QObjectPicker to select a mesh in a Qt3DWindow with the mouse.
All works as expected, if I click on the mesh, the signal QObjectPicker::clicked() is sent immediatly.

But if I set the property QRenderSettings::renderPolicy to OnDemand, then the signal QObjectPicker::clicked() is emitted only when the rendering is done (when something changes, as says the documentation of QRenderSettings::renderPolicy).

Worst, if I click several times, then each click is "stacked", until the rendering is done. Then the signals QObjectPicker::clicked() is sent serveral times.

1. launch the attached example
2. click one or more times on the black rectangle
   EXPECTED: message "Cube clicked" must appears in the console as many times as click on the rectangle.
   ACTUAL: message "Cube clicked" appears in the console as many times as click on the rectangle only if I resize the window.