Hello world program already fails when using an anchor

[themts]

Hello guys,

I wanted to try out webassembly, so after installation I simply made a hello world-app.

import QtQuick
import QtQuick.Window

Window {
    id: window
    visible: true
    width: 640
    height: 480
    visibility: Window.FullScreen
    title: qsTr("Hello WebAssembly")

    Text {
        y: 56
        text: qsTr("Hello WebAssembly")
    }
}

This code actually works, but as soon as I simply add this to my Text component, it fails.

anchors.horizontalCenter: parent.horizontalCenter

Application exit (RuntimeError: index out of bounds)

Some infos about my versions:

• QT: 6.5
• emsdk: 3.1.39

I think there must be something very basic not ok...