TCPN Structure View shows Removed Associated CAD Object

Hello All,

We removed the WTPart and CAD  - Association in the latest iteration
Now WTPart has no Related CAD Object.
Also, CAD has no Related WTPart Object.
But on WTPart Structure tab >> WTPartObject, A.X(Design) >> Structure >> Viewing >> Show (My related object.) showing Cad Object and also in below 3rd view as CAD/Dynamic Document..

Is this normal behavior from the Previous associated CAD/WTPart iteration showing CAD in WTPart latest iteration structure view or its a bug..
Thank you,
RAHUL