WebAssembly apps crash when exiting modal dialogs

import QtQuick
import QtQuick.Templates as T
Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")
    T.Dialog {
        id: dialog
        anchors.centerIn: parent
        width: 300
        height: 300
        modal: true
        background: Rectangle {
            width: 300
            height: 300
            color: "pink"
        }
        exit: Transition {
            NumberAnimation { property: "opacity"; from: 1.0; to: 0.0; duration: 100 }
        }
        Component.onCompleted: open()
    }
}