When actors are placed in a folder their attachment dependencies are no longer loaded when the root actor loads

Steps to Reproduce

1. Create a new empty wp map
2. Create five cubes, name one of them root, and attach four cubes to root
3. Save map, unload everything
4. Notice Actor attachment hierarchy is maintained in the Outliner
5. Pin (force load) root cube and notice all attached cubes load
6. Right click root cube and make folder, and Save and reload map
7. Notice attachment hierarchy is not maintained in the Outliner
8. Pin (force load) root cube and notice no children are loaded