Blueprints copied or moved to another level do not retain variable references to other Actors that are also copied or moved

Blueprints copied or moved to another level do not retain variable references to other Actors that are also copied or moved.

Reproduced in 4.7.5 binary and Main (//depot/UE4/Promotable-CL-2507843)

1. Open any project
2. Create a new level
3. Open the Levels window
4. Levels > Create New
5. Create a new Actor Blueprint, ActorA
6. Create a new Actor Blueprint, ActorB
7. In ActorA, add an editable variable of type: ActorB
8. Drop ActorA and ActorB into the Persistent Level
9. In the Details panel for ActorA, assign ActorB to the ActorB variable
10. Select ActorA and ActorB
11. Ctrl + X
12. Make the new level the current level
13. Ctrl + V

Result:
ActorA does not retain the reference to ActorB in its variable