Popup does not respect explicit size

import QtQuick 2.7
import QtQuick.Controls 2.0

ApplicationWindow {
    id: window
    width: 200
    height: 228
    visible: true

    Popup {
        x: (parent.width - width) / 2
        y: (parent.height - height) / 2
        width: parent.width / 2
        height: parent.height / 2

        visible: true
        closePolicy: Popup.NoAutoClose

        Text { text: "Popup" }
    }
}