QtQuick.Controls 2 Menu does not override other &mnemonic key shortcuts

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12

ApplicationWindow {
    width: 640
    height: 480
    title: qsTr("Hello World")
    visible: true

    onActiveFocusItemChanged: print("activeFocusItem", activeFocusItem)

    menuBar: MenuBar {
        Menu {
            title: qsTr("&Foo")
            Action {
                text: qsTr("&Ok")
                onTriggered: console.log("ok")
            }

            Menu {
                title: qsTr("&Sub")
                Action {
                    text: qsTr("&Ok")
                    onTriggered: console.log("ok")
                }
            }
        }
    }

    Button {
        text: "&Oops"
        onClicked: console.log("oops")
    }
}

#include <QtWidgets>
#include <QDebug>

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

    QObject::connect(&app, &QApplication::focusChanged, [](QWidget *oldWidget, QWidget *newWidget){
        qDebug() << "focus changed from" << oldWidget << "to" << newWidget;
    });

    QMainWindow mainWindow;

    auto fooMenu = mainWindow.menuBar()->addMenu(QObject::tr("&Foo"));
    auto fooOkAction = fooMenu->addAction(QObject::tr("&Ok"));
    QObject::connect(fooOkAction, &QAction::triggered, [](){ qDebug() << "Foo -> Ok triggered"; });

    auto subMenu = fooMenu->addMenu(QObject::tr("&Sub"));
    auto subOkAction = subMenu->addAction(QObject::tr("&Ok"));
    QObject::connect(subOkAction, &QAction::triggered, [](){ qDebug() << "Foo -> Sub -> Ok triggered"; });

    QWidget *centralWidget = new QWidget;
    mainWindow.setCentralWidget(centralWidget);

    QHBoxLayout *hBoxLayout = new QHBoxLayout(centralWidget);

    QPushButton *button = new QPushButton(QObject::tr("&Oops"), centralWidget);
    QObject::connect(button, &QPushButton::clicked, [](){ qDebug() << "Oops clicked"; });
    hBoxLayout->addWidget(button);

    mainWindow.centralWidget()->setLayout(hBoxLayout);

    mainWindow.resize(400, 400);
    mainWindow.show();

    return app.exec();
}