beta/contentSaved event publishes wrong data

Description

Steps to reproduce:

1. Add the following to the _Root.cshtml in the alloy templates at the bottom of the body tag.

   <script>

   window.addEventListener('load', function() {

   window.epi.subscribe('beta/contentSaved', function(details) {

   console.table(details);

   });

   });

   </script>

   </body>

2. Go to the site and edit a published page.
3. Look at the browser console.

Expected:
To get these values:

• oldContentLink should have a value
• hasContentLinkChanged should be true, a new version was created

Actual:
This object:

{
    contentLink: "5_115", 
    hasContentLinkChanged: false, // this part is wrong
    properties: [{…}],
    publishedContentLink: null, 
    savedContentLink: "5_115",
    successful: true,
    validationErrors: []
}