Problems with QMenu and QSystemTrayIcon on macOS

[Oleh Herashchenko]

I have small system tray application like this:

TrayApp::TrayApp(QObject *parent) : QObject(parent)
{
    m_trayIcon = new QSystemTrayIcon(this);

    m_trayMenu = new QMenu();
    m_subMenu = new QMenu("Submenu", m_trayMenu);
    connect(m_trayMenu, &QMenu::aboutToShow, this, &TrayApp::rebuildTrayMenu);
    m_trayIcon->setContextMenu(m_trayMenu);
    m_trayIcon->show();
}

void TrayApp::rebuildTrayMenu()
{
    m_trayMenu->clear();

    m_subMenu->addAction("Action_1");
    m_subMenu->addAction("Action_2");

    m_trayMenu->addMenu(m_subMenu);
    m_trayMenu->addSeparator();
    m_trayMenu->addAction(tr("Exit"), this, &TrayApp::onExitTriggered);
}

When I open subMenu for the first time (from the moment of launch until opening subMenu, no menu elements were activated) the entire menu disappears. I tried Python - same result. Qt 6.10.2, macOS 26.3