QWidget::setParent doesn't propagate font and palette from parent to children when Qt::AA_UseStyleSheetPropagationInWidgetStyles attribute is enabled

#include <QtWidgets>
int main(int argc, char* argv[])
{
    // Setting attribute prevents font and palette propagation from parent to child:
    // QApplication::setAttribute(Qt::AA_UseStyleSheetPropagationInWidgetStyles);

    QApplication a(argc, argv);
    a.setFont(QFont("Arial", 12)); // Default font
    a.setPalette(QPalette(Qt::red, {}, {}, {}, {}, {}, {})); // Default text color
    QGroupBox parent("Parent");
    parent.setFont(QFont("Times New Roman", 18));
    parent.setPalette(QPalette(Qt::yellow, {}, {}, {}, {}, {}, {}));
    QVBoxLayout layout(&parent);
    layout.addWidget(new QLabel("Child"));
    parent.show();
    return a.exec();
}

if (useStyleSheetPropagationInWidgetStyles || (!testAttribute(Qt::WA_StyleSheet)
                && (!parent || !parent->testAttribute(Qt::WA_StyleSheet))))