QWebEngineView prevents Q3DScatter from being displayed

[Reda94]

I have a Qt Main Window containing a GridLayout inside of which I added two Group Boxes (one on the left side and the other on the right). I'm aiming to display a Q3DScatter graph in the right group box and a QWebEngineView in the left one, so I've added a horizontal layout in both Group Boxes, then from my main window constructor, I created a widget container for my Q3DScatter graph which I then embedded to the horizontal layout of my right Group Box, and created a QWebEngineView which I added in turn to the horizontal layout of my left Group Box. Here's the full code of my window constructor:

GraphWindow::GraphWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::GraphWindow)
{
    ui->setupUi(this);

    //Adding the graph to my right horizontal layout (contained in my right Group Box) :

    Q3DScatter *graph = new Q3DScatter();
    QWidget *container = QWidget::createWindowContainer(graph);
    ui->right_horizontalLayout->addWidget(container, 1);

    //Adding the web view to my left horizontal layout (contained in my left Group Box) :

    QWebEngineView *view = new QWebEngineView(this);
    view->load(QUrl("path.to.some.html.file"));
    ui->left_horizontalLayout->addWidget(view, 1);
}

When executing, the QWebEngineView "page" is displayed properly but the right group box of my window (which is supposed to contain the Q3DScatter graph) appears to be empty. When I comment the QWebEngineView part of my code, the graph is displayed properly, so I deduced that there has to be something wrong with QWebEngineView which apparently doesn't allow my Q3DScatter graph to be displayed. Any help would be very welcome.

PS: Here are two screenshots, the first is what I get when executing the full code, and the second is when I comment the QWebEngineView part of the code (no web view):

Full code:

Code without adding QWebEngineView:

EDIT: I tried resizing the window by completely shrinking it and then re-expanded it, and to my surprise the graph appeared! This is obviously a Qt Bug related to QWebEngineView... Has anyone been confronted to this kind of bug before? Shrinking and then expanding the window is obviously not a solution, I'd really appreciate some actual workaround.