Inline components trigger assertion with ListElement

import QtQuick.Window 2.2
import QtQuick 2.15
Window {
    id: app
    width: 400
    height: 600
    visible: true
    component GlyphView : Item {
        ListModel {
            id: glyphModel
            ListElement {
                unicode: "\u03A8"
            }
        }
    }
   GlyphView {
       anchors.fill: parent
   }
}