ComboBox + Loader in async mode = wrong model ordering

import QtQuick 2.5
import QtQuick.Window 2.2
import QtQuick.Controls 1.4

Window {
  visible: true

  Loader {
    anchors.fill: parent
    asynchronous: true

    sourceComponent: ComboBox {
      model: ListModel {
        ListElement {text: "1"}
        ListElement {text: "2"}
        ListElement {text: "3"}
        ListElement {text: "4"}
      }
    }
  }
}

import QtQuick 2.5
import QtQuick.Window 2.2
import QtQuick.Controls 1.4

Window {
  visible: true
  width: 400; height: 400

  Loader {
    anchors.fill: parent
    asynchronous: true

    sourceComponent: ListView {
      id: listView
      delegate: Text {
        width: listView.width
        height: 30
        horizontalAlignment: Text.AlignHCenter
        verticalAlignment: Text.AlignVCenter
        text: value
      }

      model: ListModel {
        ListElement {value: "5"}
        ListElement {value: "10"}
        ListElement {value: "20"}
        ListElement {value: "50"}
      }
    }
  }
}