QSqlTableModel::beforInsert() does not work

int main(int argc, char* argv[]) {
	QApplication app(argc, argv);
	auto db = QSqlDatabase::addDatabase("QSQLITE");
	qDebug() << db.open();
	QSqlQuery q;
	qDebug() << q.exec("CREATE TABLE testtable (id integer, id2 integer)");
	qDebug() << q.exec("INSERT INTO testtable (id, id2) VALUES (1, 2)");
	QTableView tv;
	QSqlTableModel tm;
	tm.setTable("testtable");
	tm.setEditStrategy(QSqlTableModel::OnRowChange);
	tm.select();
	tv.setModel(&tm);
	QObject::connect(&tm, &QSqlTableModel::beforeInsert, [](QSqlRecord& record)
		{
			record.setValue("id", 4711);
			record.setGenerated("id", true);
			record.setValue("id2", 42);
			record.setGenerated("id2", true);
		});
	tm.insertRow(tm.rowCount());
	tm.submitAll();
	q.exec("SELECT * from testtable");
	while (q.next())
		qDebug() << q.value(0) << q.value(1);

	tv.show();
	int ret = app.exec();;
	q.exec("SELECT * from testtable");
	while (q.next())
		qDebug() << q.value(0) << q.value(1);
	return ret;
}