TextField keyboard input doesn't work on Popup

TextFiled keyboard input doesn't work on Popup if popupType is Popup.Window or Popup.Native . If poputType is Popup.Item evereythink works ok. 

Bug reproduction code:

import QtQuick
import QtQuick.Controls

Window {
    id: root
    x: 200
    y: 200
    width: 450
    height: 700
    visible: true
    color: "green"

    Popup{
        width: 100
        height: 300
        visible: true

        //popupType: Popup.Item // textField keyboard input OK
        //popupType: Popup.Native // textField keyboard input doesn't work
        popupType: Popup.Window // textField keyboard input doesn't work

        background: Rectangle

        contentItem: TextField

    }
}