Issue Summary

On a page that has image thumbnails, upon clicking on Edit for the page, the thumbnails will appear as "Unknown attachment"

Steps to Reproduce

1. Click on Edit on a page with image thumbnails
2. You will see the thumbnails show as "Unknown attachment"

Expected Results

Images should appear as they do in published mode

Actual Results

Images appear as "unknown attachment"

Workaround

• For the affected page, go into edit mode and publish the page. It will trigger a new version of the page.
• Now revert the page to the very first version ( where page was migrated initially)
• You will notice that page is reverted in the editor and all the images are shown as expected.
• Also, migrating the page to the new editor from the legacy editor will work as well.