Non-interactive controls are blocking touch

import QtQuick 2.7
import QtQuick.Controls 2.0

ApplicationWindow {
    id: window
    width: 300
    height: 300
    visible: true
    color: ma.pressed ? "yellow" : "white"

    MouseArea {
        id: ma
        anchors.fill: parent
        Column {
            anchors.centerIn: parent
            BusyIndicator { }
            PageIndicator {
                count: 10
            }
        }
        ScrollIndicator {
            active: true
            size: 0.5
            width: 20
            height: parent.height
            anchors.right: parent.right
        }
    }
}