Material: changing primary/accent colors doesn't update dependent colors in popup and it's children

import QtQuick 2.6
import Qt.labs.controls 1.0
import Qt.labs.controls.material 1.0

ApplicationWindow {
    id: main

    visible: true
    width: 640
    height: 480

    Material.accent: Material.Blue

    Rectangle {
        anchors.fill: parent
        color: Material.textSelectionColor
    }

    Popup {
        id: popup
        width: 200
        height: 200
        contentItem: Label {
            color: popup.Material.textSelectionColor
            text: "Test text"
            font.pixelSize: 26
        }
        Component.onCompleted: open()
    }

    Popup {
        width: 200
        height: 200
        x: main.width - width
        y: main.height - height
        contentItem: Label {
            color: Material.textSelectionColor
            text: "Test text"
            font.pixelSize: 26
        }
        Component.onCompleted: open()
    }
}