Angular Google Maps: Marker's options not updating

var $app = angular.module('appMaps', ['google-maps']);

$app.controller('mainController', ['$rootScope', '$scope', '$location', '$timeout',
  function($rootScope, $scope, $location, $timeout) {
    
    $scope.windowClick = function() {
      alert('window click');
    }
    
    $scope.map = {
      control: {},
      center: {
          latitude: -33.5,
          longitude: -70.7
      },
      zoom: 12,
      markers: [{
        coordinates: {
          latitude: -33.433441,
          longitude: -70.71817
        },
        options: {
          id: 1,
          title: "New point 1",
          draggable: true
        }
      }, {
        coordinates: {
          latitude: -33.428441,
          longitude: -70.74
        },
        options: {
          id: 2,
          title: "New point 2",
          draggable: true
        }
      }],
      markers2: [{
        id: 3,
        labelTitle: 'Point 3',
        coordinates: {
          latitude: -33.5,
          longitude: -70.7
        },
        options: {
          id: 3,
          title: "New point 3", // Can't be used as labelContent
          draggable: false
        },
        showWindow: false,
        markerClick: function() {
          this.showWindow = true;
          $scope.$apply();
        }
      }]
    };
  }
]);

<!DOCTYPE html>
<html ng-app="appMaps">
<head>
  <meta charset="utf-8" />
  <title>AngularJS Plunker</title>
  <link rel="stylesheet" href="style.css" />
  <script src='//maps.googleapis.com/maps/api/js?sensor=false'></script>
  <script data-require="angular.js@1.2.x" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.16/angular.min.js" data-semver="1.2.16"></script>
  <script src="http://underscorejs.org/underscore-min.js" type="text/javascript"></script>
  <script src="http://rawgithub.com/nlaplante/angular-google-maps/master/dist/angular-google-maps.js"></script>
  <script src="app.js"></script>
</head>
<body ng-controller="mainController">
  <div id="map_canvas">
    <google-map center="map.center" zoom="map.zoom" draggable="true" control="map.control">
      <!-- <marker ng-repeat="m in map.markers" coords="m.coordinates" options="m.options">
        If marker label is added, dragging the marker will not work
        <marker-label content="m.options.title" anchor="22 0" class="marker-labels"></marker-label>
      </marker> -->
      <marker ng-repeat="m in map.markers2" coords="m.coordinates" 
        labelContent="'labelTitle'" 
        labelAnchor="22 0" 
        labelClass="marker-labels"
        options="m.options" click="m.markerClick()">
        <window show='m.showWindow'>
          <div>
                        <a href="javascript:void(0)" ng-click="windowClick()">hit me</a>
                        <p>Test ng-click in window</p>
          </div>
        </window>
      </marker>
    </google-map>
  </div>
</body>
</html>

.angular-google-map-container {
    width: 100%;
    height: 600px;
}