title: field:uid = field:pid bug in TYPO3 v 8.7.x?
body: <p>The output of {field:uid} is the same as {field:pid}</p>
  
  <p>Does anybody know a way how to output the fluid styled content element id
  instead of the page uid.
  The output of {data.uid} is correct.</p>
  
  <p>Till TYPO3 version 7.6.x the following code worked
  Now (TYPO3 8.7.1) the output field:uid = field:pid. </p>
  
  <p>Is it a TYPO3 bug?</p>
  
  <pre><code>lib.contentElement.settings.media.popup.linkParams.ATagParams.dataWrap = class="lightbox" data-fancybox-group="lightbox-{field:uid}" title="{file:current:title}"
  lib.contentElement.settings.media.popup.linkParams.ATagParams.dataWrap.insertData = 1
  </code></pre>