Error when displaying diffs for pages having attached object of type DocumentationClass inside Change Request

I tested this locally (XWiki 17.10.7, CR 1.22.3, Doc App 1.13.2) as an admin user with full admin rights.

Steps to reproduce:

1. Create a documentation page (a page that has a

   DocumentationClass

   object attached to it).

2. Add content to any field of the page (or leave it empty).
3. Save it as a Change Request (new CR or existing CR).
4. Inside the Change Request, open the “Proposed changes” tab.
5. Open the “rendered” view of the documentation.

Actual result:
The following error is displayed:

“Failed to execute the [velocity] macro. Cause: [The execution of the [velocity] script macro is not allowed in [xwiki:DocApp.Code.DocumentationSheet]. Check the rights of its last author or the parameters if it's rendered from another script.] Click on this message for details.”

Expected result:
The documentation diffs should be rendered correctly without errors.