Loader and ComponentBehaviour Bound seem incompatible

pragma ComponentBehavior: Bound
import QtQuick

Window {
    id: root
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    property int count: 5

    Column {
        Loader {
            sourceComponent: Item {}
        }

        Repeater {
            model: root.count

            Text {
                id: item
                required property int index
                text: "Item: " + item.index + "/" + root.count
            }
        }
    }
}