Issue Summary

The Create page REST API endpoint recently started to return a 400 (Bad Request) error when attempting to create pages with ri:page elements in ac:link macros.

Steps to Reproduce

Send a POST request with the following body to the /wiki/api/v2/pages endpoint (replace the uppercase placeholders SPACE_ID, PARENT_PAGE_ID, and PAGE_TITLE with actual values):

{
  "spaceId": "SPACE_ID",
  "status": "current",
  "title": "Example",
  "parentId": "PARENT_PAGE_ID",
  "body": {
    "representation": "storage",
    "value": "<ac:link ac:card-appearance=\"inline\"><ri:page ri:content-title=\"PAGE_TITLE\" /><ac:link-body>PAGE_TITLE</ac:link-body></ac:link>"
  }
}

The endpoint responds with the following error instead of creating the page:

{
  "errors": [
    {
      "status": 400,
      "code": "BAD_REQUEST",
      "title": "Content contains unsupported extensions and cannot be edited in Fabric editor",
      "detail": null
    }
  ]
} 

Expected Results

The endpoint should create the page.

Actual Results

400 error:

{
  "errors": [
    {
      "status": 400,
      "code": "BAD_REQUEST",
      "title": "Content contains unsupported extensions and cannot be edited in Fabric editor",
      "detail": null
    }
  ]
} 

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available