title: SensorKit - Fetching data don't call results delegate function
body: <p>Recently we got approved by Apple to use SensorKit. Here are all prerequisites I checked:</p>
  <ul>
  <li>I'm pretty sure the project is configured properly. Entitlements file contains list of all sensors, Info.plist contains <code>NSSensorKitUsageDescription</code>, <code>NSSensorKitUsageDetail</code> and <code>NSSensorKitPrivacyPolicyURL</code>.</li>
  <li>When I request authorization for a sensor (e.g. accelerometer) the system dialog is presented, I approve it and it's clearly allowed in phone <code>Settings -&gt; Privacy -&gt; Research Sensor &amp; Usage Data</code> section</li>
  <li>I started recording for a sensor</li>
  <li>I waited more than 24h (6 days actually)</li>
  <li>I created <code>SRFetchRequest</code> (see the code below) with correct time interval</li>
  </ul>
  <pre><code>let now = Date()
  let from = Date(timeInterval: -3 * 24 * 60 * 60, since: now) as NSDate
  let to = Date(timeInterval: -2 * 24 * 60 * 60, since: now) as NSDate
  
  let request = SRFetchRequest()
  request.device = SRDevice.current
  request.from = from.srAbsoluteTime
  request.to = to.srAbsoluteTime
  reader.fetch(request)
  </code></pre>
  <p>What's interesting, no error is triggered. Actually the <code>func sensorReader(_ reader: SRSensorReader, didCompleteFetch fetchRequest: SRFetchRequest)</code> delegate method is invoked but <code>func sensorReader(_ reader: SRSensorReader, fetching fetchRequest: SRFetchRequest, didFetchResult result: SRFetchResult&lt;AnyObject&gt;) -&gt; Bool</code> method never gets called.</p>
  <p>Did anyone make it working? Any ideas why it's not working?</p>