`QWebEnginePage` without using `QWebEngineView` creates a `QtWebEngineProcess` process that begins to consume up to 2GB of memory nonstop.

Console print message:
"js: Uncaught (in promise) Error: The manifest specifies content that cannot be displayed on this browser/platform."

Simple sample for demonstrate this bug:

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);

    QWebEnginePage *page = new QWebEnginePage(&a);
    page->load(QUrl("https://www.facebook.com/echomsk.ru"));

    return a.exec();
}