Invalid argument passed to formatTime

This code works when using qt_add_executable and resources (qtbug113808-old.zip), but not qt_add_qml_module (qtbug113808-new.zip):

import QtQuick
import QtQuick.Controls.Fusion

ApplicationWindow {
    id: root
    width: 640
    height: 480
    visible: true
    title: Qt.formatTime(root.time, "hh")

    property var time: new Date(1970, 1, 1, 0, 0)
}

The fact that this doesn't work blocks https://codereview.qt-project.org/c/qt/qtdeclarative/+/470153 and https://codereview.qt-project.org/c/qt/qtdeclarative/+/470154 from being merged to 6.5.

https://doc.qt.io/qt-6/qml-qtqml-qt.html#formatTime-method says:

The time parameter may be a JavaScript Date object, a QTime, or QDateTime value.

In dev, the example works: https://codereview.qt-project.org/c/qt/qtdeclarative/+/470154/1#message-df1b6f66bfa4a02d08a49880841ba3b5b56ebedf