Actors in a folder in outliner are moved to the top level by duplicating the world partition level with WorldPartitionRenameDuplicateBuilder

1. Create a project
2. Create a level with OpenWorld template
3. Place some actors in the level
4. Create a folder in outliner
5. Move the actors into the folder
6. Save the level
7. Quit the edtior
8. Run WorldPartitionRenameDuplicateBuilder
   Example command line is

   [uproject path] [path to the level] -run=WorldPartitionBuilderCommandlet -SCCProvider=None -builder=WorldPartitionRenameDuplicateBuilder -NewPackage=/Game/UDN/Dest/Map5

9. Launch the editor after the commandlet ends
10. Open the duplicated level
11. See outliner

Result :

Actors in the folder move to the toplevel in outliner

Expected result :

Actors in the folder stays in the folder