POWL : CATS Workitem forward still visible in fwd'ing Mgnr inbox

Hi

I'm not sure if this is a standard behaviour but would like to confirm on how it works. I have a CATS workitem (WF) created by an employee which is assigned to Manager MGR1. The Manager MGR1 forwards the work item to MGR2. Now in POWL with some config & customization i can see workitem in the detail view of the MGR2 inbox but the workitem still exists in MGR1 inbox. Wondering if this is a standard case if not what would be the approach to fix it? appreciate any helpful hints

Inbox accessed via POWL (NWBC)

thanks