XenApp shadowing does not logoff user session

When helpdesk team close the shadowing session ICA shadowing session does not logoff from the server. Because of this reason no more shadowing will be allowed on this server by same users. Let's find out how does it happen . I am shadowing "citrix.test" using user "citrix.test" . This is what shown under App control center

When this session is terminated via Ctrl+ *

This will still be shown under App Center as disconnected

This disconnected session does not logoff  shadowing session gracefully. After looking at task manager it has been found that couple of process which was still running with PID

we were not able to kill Symantec Service Framework service even using local admin or domain admin

Created GPO and deliver following key using "Create" option

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Citrix\wfshell\TWI

Value Name:LogoffCheckSysModules
Type:REG_SZ
String: ccSvcHst.exe

as explained in CTX891671. After this registry changes Ctrl + * use to close the shadowing session.