Qt.labs.platform MenuSeparator not painted on Windows

import QtQuick 2.10
import QtQuick.Window 2.3

import Qt.labs.platform 1.0 as Platform

Window {
    id: window
    width: 640
    height: 480
    visible: true

    Platform.MenuBar {
        Platform.Menu {
            id: fileMenu
            objectName: "fileMenu"
            title: qsTr("File")

            Platform.MenuItem {
                text: qsTr("New")
            }

            Platform.MenuItem {
                text: qsTr("Open")
            }

            Platform.MenuItem {
                text: qsTr("Save")
            }
        }

        Platform.Menu {
            title: qsTr("Edit")

            Platform.MenuItem {
                text: qsTr("Undo")
            }

            Platform.MenuItem {
                text: qsTr("Redo")
            }

            Platform.MenuSeparator {}

            Platform.MenuItem {
                text: qsTr("Copy")
            }

            Platform.MenuItem {
                text: qsTr("Paste")
            }

            Platform.MenuSeparator {}

            Platform.MenuItem {
                text: qsTr("Select All")
            }

            Platform.MenuSeparator {}

            Platform.MenuItem {
                text: qsTr("Flip Horizontally")
            }

            Platform.MenuItem {
                text: qsTr("Flip Vertically")
            }
        }
    }
}