Sometimes ShaderEffect types are not be drawn correctly on 2 QQuickWindows

// qtdeclarative/src/quick/scenegraph/qsgthreadedrenderloop.cpp

 void QSGRenderThread::invalidateGraphics(QQuickWindow *window, bool inDestructor)
 {
     qCDebug(QSG_LOG_RENDERLOOP, QSG_RT_PAD, "invalidateGraphics()");    

     if (!rhi)
         return;    

     if (!window) {
         qCWarning(QSG_LOG_RENDERLOOP, "QSGThreadedRenderLoop:QSGRenderThread: no window to make current...");
         return;
     }
     bool wipeSG = inDestructor || !window->isPersistentSceneGraph();
     bool wipeGraphics = inDestructor || (wipeSG && !window->isPersistentGraphics());    

     bool current = true;
     if (rhi)
         rhi->makeThreadLocalNativeContextCurrent();    

     if (Q_UNLIKELY(!current)) {
         qCDebug(QSG_LOG_RENDERLOOP, QSG_RT_PAD, "- cleanup without an OpenGL context");
     }    

     QQuickWindowPrivate *dd = QQuickWindowPrivate::get(window);    

     // The canvas nodes must be cleaned up regardless if we are in the destructor..
     if (wipeSG) {
         dd->cleanupNodesOnShutdown();
- #if QT_CONFIG(quick_shadereffect)
-         QSGRhiShaderEffectNode::cleanupMaterialTypeCache();
- #endif
     } else {
         qCDebug(QSG_LOG_RENDERLOOP, QSG_RT_PAD, "- persistent SG, avoiding  cleanup");
         return;
     }