title: Wordpress REST API _fields and _embed parameters are not working simultaneously
body: <p>If you call the REST API using _embed parameter you will be able to get the embedded objects as "_embedded" JSON object of returned JSON as following:</p>
  
  <pre><code>/?rest_route=/wp/v2/posts&amp;_embed
  </code></pre>
  
  <p>And if you use _fields parameter you can filter out the objects returned by API like:</p>
  
  <pre><code>/?rest_route=/wp/v2/posts&amp;_fields=id,content,title
  </code></pre>
  
  <p>The problem is when both are_embed and _filter are used simultaneously the results returned do not contain "_embedded" JSON object no matter what combination of filter I apply. For example:</p>
  
  <pre><code>/?rest_route=/wp/v2/posts&amp;_embed&amp;_fields=id,content,title,_embedded
  </code></pre>
  
  <p>does not return "_embedded" JSON object</p>
  
  <p>Worpress Version is 5.3.2 (Latest)</p>
  
  <p>And pretty permalinks are not enabled so usage of "/?rest_route=" is mandatory</p>