After Apply Exchange 2013 CU6 New-MoveRequest for Cross-Forest Migration get Error "Recipient isn't a mailbox"

We have to migrate Mailbox in a Cross Forest environment (from Exchange 2007 SP3-RU10 to Exchange 2013).For Account coesistence we already migrate Users/Group via ADMT, excluding Exchange Attribute.

The steps are:

• Enable-MailUser
• Prepare-MoveRequest.Ps1
• New-MoveRequest.

Before to Upgrade to CU6, the migrations steps described above worked fine (Exchange Server 2013 SP1 (alias CU4))

After ugrading we alway get the following error running New-MoveRequest:

New-MoveRequest -Identity "02909" -Remotelegacy -RemoteCredential $RemoteCredentials

-TargetDeliverydomain "old.mycompany.com" -TargetDatabase MBOX2A -RemoteGlobalCatalog "odl_dc.mycompany.local"

–DomainController “new_dc.newdomain.int”-verbose

New-MoveRequest -Identity "user200" -Remotelegacy -RemoteCredential $RemoteCredentials

-TargetDeliverydomain "new.mycompany.com" -TargetDatabase MBOX2A

-RemoteGlobalCatalog "old_dc.mycompany.local" -verbose

Recipient '4309a8a0-9edf-4ad1-991b-89d8d75a1c28' isn't a mailbox.

+ CategoryInfo : NotSpecified: (:) [New-MoveRequest], RemotePermanentException

+ FullyQualifiedErrorId : [Server=mailbox1,RequestId=f3bd2350-a9dc-49d1-8cf6-f5564a47bd26,

      TimeStamp=17/11/2014 01:45:59]

      [FailureCategory=Cmdlet-RemotePermanentException]

            17FEEA0A,Microsoft.Exchange.Management.RecipientTasks.NewMoveRequest

   + PSComputerName       : mailcas1.newdomain.int

I have found the below article which is the exact issue that I am having.

https://support.software.dell.com/migration-manager-for-exchange/kb/133684

Is there anyway to get HotFix on this problem. I cannot wait two months fo CU7.

In addition downgrade (e.g. Uninstall CU6 and re-installa SP1) is quite complicate and hard.