Pushing Qt.binding to JS variable in StackView results in the pushed item's property not reacting to changes

        // push([component, {binding}]) - with JS variable in binding
        var jsVariable = false
        var item7 = control.push([itemComponent, {objectName: Qt.binding(() => {
            return jsVariable.toString() })}], StackView.Immediate)
        compare(item7.objectName, "false")
        compare(control.depth, 7)
        compare(control.currentItem, item7)
        jsVariable = true
        compare(item7.objectName, "true") // fails - still "false"

import QtQuick
import QtQuick.Controls

ApplicationWindow {
    width: 400
    height: 400
    visible: true

    property bool bound

    Component.onCompleted: {
        var aFlag = false
        bound = Qt.binding(() => {
            return aFlag.toString()
        })
        aFlag = true
        print(bound)
    }

        property bool qmlProperty
[...]
        // push([component, {binding}]) - with QML property in binding
        qmlProperty = false
        var item8 = control.push([itemComponent, {objectName: Qt.binding(() => {
            return testCase.qmlProperty.toString() })}], StackView.Immediate)
        compare(item8.objectName, "false")
        compare(control.depth, 8)
        compare(control.currentItem, item8)
        qmlProperty = true
        compare(item8.objectName, "true")