If a CC Role user clicks a workflow notification he/she can access data he/she does not have permission granted, f.e. compensation data.
The current Employee Central system functionality is that Workflow Approvals do not respect the RBP permissions of CC role members involved in a workflow. It is by design.
If you do not want the CC User to land in WF Approval Page of a Completed WF Request, please set the property "Redirect CC User to Workflow Approval Page" to 'No'. Doing this, the CC User when clicks on completed WF Notification would land on Employee Profile page where RBP would be effective.
KBA , LOD-SF-EC , Employee Central , LOD-SF-EC-RBP , Roles & Permissions , Problem