Cannot Reply to Annotations from the Annotation tab

• Go to Administration and from Look & Feel - Presentation change the value for "Show Page Annotations" from "No" to "Yes" or default.
• The #docextra area will display a separate tab for Annotations, in addition to the Comments one

• You can reply comments to annotation from the "Comments" tab,
  
  but although there is a Reply button in the "Annotations" tab,
  
  this can't be used, see BUG.png
  

XWiki class defining annotations structure is XWiki.XWikiComments

Note 1: clicking on "Edit annotation" pencil from the Annotation tab and pressing after Cancel, will make the "Reply" button to disappear, see

Note 2: "View thread" link from the annotation popover has no effect on the "Annotations" tab, but works on the "Comments" tab, see

So there are multiple issues when creating, displaying, accessing threaded comments from the Annotations tab.