QEvent fails on dynamic_cast to QKeyPressEvent received from QtWebEngine

#include "mainwindow.h" 
 #include "ui_mainwindow.h" 
 
 #include <QKeyEvent> 
 #include <QDebug> 
 #include <QtWebEngineWidgets/QtWebEngineWidgets> 
 
 MainWindow::MainWindow(QWidget *parent) : 
     QMainWindow(parent), 
     ui(new Ui::MainWindow) 
 { 
     ui->setupUi(this); 
     QWebEngineView *browser = new QWebEngineView{}; 
 
     setCentralWidget(browser); 
 } 
 
 MainWindow::~MainWindow() 
 { 
     delete ui; 
 } 
 
 bool MainWindow::event(QEvent *event) 
 { 
        QKeyEvent *event1 = dynamic_cast<QKeyEvent*>(event);
        return QMainWindow::event(event); 
 }