QGraphicsView: no mouse events in wasm

#include <QApplication>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QGraphicsItem>
#include <QGraphicsSceneMouseEvent>
struct MyItem : QGraphicsItem
{
    QRectF boundingRect() const override
    {
        return {100, 100, 100, 100};
    }

    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override
    {
        painter->setPen(QPen(QColor(Qt::darkGray).darker(), 3));
        painter->setBrush(Qt::lightGray);
        painter->drawRect(boundingRect());

        painter->drawText(boundingRect(), m_text);
    }

    void mousePressEvent(QGraphicsSceneMouseEvent *event) override
    {
        m_text = QString("press: x: %1, y: %2")
                .arg(event->scenePos().x())
                .arg(event->scenePos().y());
        event->accept();
        update();
    }

    void mouseMoveEvent(QGraphicsSceneMouseEvent *event) override
    {
        m_text = QString("move: x: %1, y: %2")
                .arg(event->scenePos().x())
                .arg(event->scenePos().y());
        event->accept();
        update();
    }

    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override
    {
        m_text = QString("release: x: %1, y: %2")
                .arg(event->scenePos().x())
                .arg(event->scenePos().y());
        event->accept();
        update();
    }

    QString m_text;
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QGraphicsScene b;
    b.addItem(new MyItem);
    QGraphicsView v{&b};
    v.setWindowFlags(Qt::Window | Qt::FramelessWindowHint);
    v.showFullScreen();

    return a.exec();
}

struct MyView : QGraphicsView
{
    using QGraphicsView::QGraphicsView;

    void mousePressEvent(QMouseEvent *event) override
    {
        qDebug() << "press" << event;
        QGraphicsView::mousePressEvent(event);
    }

    void mouseReleaseEvent(QMouseEvent *event) override
    {
        qDebug() << "release" << event;
        QGraphicsView::mouseReleaseEvent(event);
    }

    void mouseMoveEvent(QMouseEvent *event) override
    {
        qDebug() << "move" << event;
        QGraphicsView::mouseMoveEvent(event);
    }
};