You enabled Permission for Acronis Backup in self-service. You log in to Plesk with a user account and want to see the contents of a recovery point.
The recovery point is empty when you click on it.
The issue first occured after the plugin update to 1.5.1-338.
Issue in the product. Plugin implementation has been reworked in update 1.5.1-338 to work with metadata using logins, not IDs, which caused this problem with Plesk users in Power User mode.
Update to extension version 1.5.3.