Presses and releases leak through modal Menu

import QtQuick 2.7
import QtQuick.Controls 2.0

ApplicationWindow {
    id: window
    width: 400
    height: 400
    color: "#ffffff"
    visible: true

    MouseArea {
        id: mouseArea
        anchors.fill: parent
        hoverEnabled: true
        acceptedButtons: Qt.LeftButton | Qt.RightButton

        onPressed: print("pressed")

        onReleased: {
            print("released")
            if (mouse.button === Qt.RightButton && !contextMenu.visible) {
                contextMenu.open();
            }
        }

        Menu {
            id: contextMenu
            objectName: "tilesetContextMenu"
            parent: window.contentItem
            modal: true
            dim: false

            MenuItem {
                id: duplicateMenuItem
                objectName: "duplicateTileMenuButton"
                text: qsTr("Duplicate")
            }

            MenuItem {
                objectName: "rotateTileLeftMenuButton"
                text: qsTr("Rotate 90° Left")
            }

            MenuItem {
                objectName: "rotateTileRightMenuButton"
                text: qsTr("Rotate 90° Right")
            }
        }
    }
}