[Windows] QMouseEvent gives a wrong mouse position when a context menu is shown

// MainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

class MyWidget : public QWidget
{
    Q_OBJECT

public:
    MyWidget();

signals:
    void contextMenu(const QPoint& pos);

public slots:
    void handleContextMenu(const QPoint& pos);

protected:
    void mousePressEvent(QMouseEvent* event) override;
    void mouseReleaseEvent(QMouseEvent* event) override;
};

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
};

#endif // MAINWINDOW_H

// MainWindow.cpp

#include "mainwindow.h"
#include <QMenu>
#include <QMouseEvent>

MyWidget::MyWidget()
{
    setAttribute(Qt::WA_NoMousePropagation);
    setFocusPolicy(Qt::ClickFocus);
    setMouseTracking(true);

    connect(this, &MyWidget::contextMenu, this, &MyWidget::handleContextMenu);
}

void MyWidget::handleContextMenu(const QPoint& pos)
{
    auto menu = new QMenu(this);
    menu->setAttribute(Qt::WA_DeleteOnClose);

    menu->addAction("Action 1");
    menu->addAction("Action 2");
    menu->addAction("Action 3");
    menu->addAction("Action 4");
    menu->addAction("Action 5");

    menu->popup(mapToGlobal(pos));
}

void MyWidget::mousePressEvent(QMouseEvent* event)
{
    emit contextMenu(event->pos());
}

void MyWidget::mouseReleaseEvent(QMouseEvent* event)
{
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    setCentralWidget(new MyWidget);
    resize(200,200);
}

MainWindow::~MainWindow() {}