Unable to remove warning, "Qt WebEngine seems to be initialized from a plugin..."

Running the Minibrowser example (https://doc.qt.io/qt-6/qtwebview-minibrowser-example.html ) produces this message: 

Qt WebEngine seems to be initialized from a plugin. Please set Qt::AA_ShareOpenGLContexts using QCoreApplication::setAttribute and QSGRendererInterface::OpenGLRhi using QQuickWindow::setGraphicsApi before constructing QGuiApplication.

However, the message persists even after modifying the example:

QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts);
QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGLRhi);
QtWebView::initialize();
QGuiApplication app(argc, argv);
...

The way Qt is starting up in the QGuiApplication/QCoreApplication constructors and with the plugin architectures means that initialize() in qtwebenginecoreglobal.cpp is run before anything has actually given Qt a chance to create the shared OpenGL context, so although the attribute is set, qt_gl_global_share_context() still returns null.

Is it safe to simply ignore this warning? The application seems to run without ill effects.