Why does the test fail if I wrap the catch in Ember.run?

service.js

// .... service boilerplate 
 doAsyncThing() {
    return get(this, 'someService').postV2Request().catch((e) => {
     // If I wrap this code in Ember.run, the tests fail after upgrading to Ember 2.13 from 2.3
      let logError = new Error('foobar error');
      this.reportError(logError);
      throw(e);
    });
  }
// ... service boilerplate

test.js

test('doAsyncThing reports an error if there is one', function(assert) {
  assert.expect(3);
  let done = assert.async();
  let deferred = RSVP.defer();
  let apiService = mock({
    postV2Request: sinon.stub().returns(deferred.promise)
  });
  let reportErrorStub = sinon.stub();
  let service = this.subject({
    apiService,
    reportError: reportErrorStub
  });

  service.doAsyncThing('foo', 'bar', 'baz').catch(() => {
    assert.ok(true, 'The exception is rethrown');
    assert.ok(reportErrorStub.called, 'reportError was called');
    assert.equal(reportErrorStub.args[0][0].message, 'foobar error', 'format of message is ok');
    done();
  });

  deferred.reject();
});