I was surprised that it didn't work as expected and there was no issue on it. Create a comment with a link to a page. Now rename the page. Go back to the comment and the link is now broken - shows not as an add page reference. This is pretty common and you only need to look at the atlassian confluence site for a significant number of links in comments that are no longer valid due to page name changes! Especially true when trying to refactor pages to be more consistent with conventions etc....