QML Window title not initially shown correctly

import QtQuick 2.6
import QtQuick.Controls 2.0
import QtQuick.Window 2.1 // works with 2.0

Window {
    objectName: "window"
    width: 1200
    height: 600
    title: "My Custom Title!"
//    title: "My Custom Title - " + (project.loaded ? ("Untitled" + (project.unsavedChanges ? "*" : "")) : "None")
    visible: true

    readonly property int controlSpacing: 10

    QtObject {
        id: project
        objectName: "project"

        property bool loaded: false
        property url url: ""
        property bool unsavedChanges: false
    }

    Button {
        text: "Load project"
        anchors.centerIn: parent
        onClicked: {
            project.loaded = true;
            project.unsavedChanges = true;
        }
    }
}

#include <QGuiApplication>
#include <QtQml>

int main(int argc, char *argv[])
{
    QGuiApplication *app = new QGuiApplication(argc, argv);
    app->setOrganizationName("OrganizationName");
    app->setApplicationName("ApplicationName");
    app->setOrganizationDomain("OrganizationDomain");
    app->setApplicationDisplayName("ApplicationDisplayName");
    app->setApplicationVersion("0.0");

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    Q_ASSERT(!engine.rootObjects().isEmpty());

    return app->exec();
}