permanentlyDelete and restore batch APIs from services.refactoring don't work

This issue concerns the permanentlyDelete and restore functions of the services.refactoring API that take a batch as a parameter, introduced by XWIKI-15787, and documented in https://extensions.xwiki.org/xwiki/bin/view/Extension/Refactoring%20Module#HRestoreabatchofdeleteddocuments28since29 .

How to reproduce:

• create a page
• delete this page
• from the recycle bin or in the view screen of the deleted page, copy the batch id that corresponds to this page deletion
• in a page, attempt the permanently delete using the following piece of script (in a groovy script):

  {{groovy}}
  def batchid = "<fill in the copied batch id here>"
  services.refactoring.permanentlyDelete(batchid).join()
  {{/groovy}}
  

• in another page (or the same), attempt the restore of the batch using the following piece of script (in a groovy script):

  {{groovy}}
  def batchid = "<fill in the copied batch id here>"
  services.refactoring.restore(batchid).join()
  {{/groovy}}
  

Expected result:

• depending on the used script, the batch is permanently deleted or restored

Actual result:

• there is no impact on the pages in the recycle bin (nor permanent deletion nor restore)
• in the logs of the permanentlyDelete or restore jobs (if fetched from the job logs), the following message appears:

The author [null] of this script is not allowed to permanently deleted document [xwiki:Sandbox.Test page to delete()] with id

The author [null] of this script is not allowed to restore document [xwiki:Sandbox.Test page to delete()] with ID [28]