WorldPartitionRenameDuplicateBuilder rename breaks soft object refs

Renaming map using builder will break soft obj refs and warnings will also appear in the log:

Warning: Serialized Class /Script/Engine.World for a property of Class /Script/Engine.Actor. Reference will be nullptred.    Property = SoftObjectProperty /Game/ActorWithSoftRef.ActorWithSoftRef_C:SoftRef    Item = World /Game/SoftRefsIssueRename.SoftRefsIssueRenameWarning: Serialized Class /Script/Engine.World for a property of Class /Script/Engine.Actor. Reference will be nullptred.    Property = SoftObjectProperty /Game/ActorWithSoftRef.ActorWithSoftRef_C:SoftRef    Item = World /Game/SoftRefsIssueRename.SoftRefsIssueRename 

Repro project provided from UDN:

• Open `SoftRefIssueRename` map.
• Check that `ActorWithSoftRef` and `ActorWithSoftRef2` have soft obj refs to each other.
• Close and then run WorldPartitionRenameDuplicateBuilder:
  • UnrealEditor.exe "WPDupBugs.uproject" "/Game/DuplicateActorIssue" -run=WorldPartitionBuilderCommandlet -builder=WorldPartitionRenameDuplicateBuilder -NewPackage=/Game/DuplicateActorIssueRename -Rename
• Open map and check the actors.
• The refs are now `none`

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