GUISupport QtQuick with two render windows

I am trying to re-write
with two VTKRenderWindow instead of one, I cannot make it work (it’s rendering a single black screen, whereas original code correctly shows the cone and the widget), any suggestion?
The main reason I want to have two VTKRenderWindow is to have separate custom interactor style for each renderers.
Configuration: Qt6 VTK9.3