Protractor times out waiting for sync with page when using $resource

I'm testing Protractor with a small AngularJS app.

This is the test:

describe('Testing Protractor', function() {
  var draftList;

  it('should count the number of drafts', function() {
    browser.get('#/');
    draftList = element.all(by.repeater('newsletter in drafts'));
    expect(draftList.count()).toEqual(2);
  });
});

Controller:

angular.module('myApp.controllers', []).
  controller('DraftsCtrl', ['$scope', 'Draft', function($scope, Draft) {
    $scope.drafts = Draft.query();
}])

Draft service:

angular.module('myApp.services', ['ngResource']).
  factory('Draft', ['$resource',
    function($resource) {
      return $resource('api/drafts/:id')
    }])

Running this test using Protractor results in the following error:

Error: Timed out waiting for Protractor to synchronize with the page after 11 seconds

However, if in the controller I change this line:

$scope.drafts = Draft.query();

to this:

$scope.drafts = [];

The test fails as expected, but more importantly: it does not time out.

With query() enabled, both when running the app manually in a browser and when looking at the browser window opened by Protractor, the data returned by the API is correctly displayed by a repeater.

Why is Protractor not able to synchronize with the page when the service is communicating with the API?

AngularJS is v1.2.0-rc3. Protractor is v0.12.0.

This is a known issue, but there is a temporary workaround. Set ptor.ignoreSynchronization = true.

For example:

describe('Testing Protractor', function() {
  var draftList;
  var ptor;

  beforeEach(function() {
    ptor = protractor.getInstance();
    ptor.ignoreSynchronization = true;
  });

  it('should count the number of drafts', function() {
    ptor.get('#/');
    draftList = element.all(by.repeater('newsletter in drafts'));
    expect(draftList.count()).toEqual(2);
  });
});