styleHints()->setShowShortcutsInContextMenus(true) has no effect

styleHints()->setShowShortcutsInContextMenus(true)

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    a.styleHints()->setShowShortcutsInContextMenus( true );

    QWidget w;
    w.setContextMenuPolicy(Qt::ActionsContextMenu);

    QAction act("Copy", nullptr);
    act.setShortcut(QKeySequence::Copy);
    // act.setShortcutVisibleInContextMenu(true);  // Workaround
    w.addAction(&act);

    w.show();

    return a.exec();
}