ApplicationWindow.contentItem shadows Window.contentItem

import QtQuick
import QtQuick.Controls.Basic

ApplicationWindow { // Change "ApplicationWindow" -> "Window" for investigation
    id: window
    width: 640
    height: 480
    visible: true

    TextEdit {
        anchors.centerIn: parent
        text: "window.contentItem: " + window.contentItem + '\n' // Regular property
            + "Window.contentItem: " + Window.contentItem        // Attached property
    }
}