Actors gets moved away from the pivot when replacing an existing Packed Level Actor in a Level instance with external actors.

Licensee: When I try to create a new Packed Actor and replace an existing one in a Level instance, the actor gets moved away from the pivot.

Repro steps:

• Launch the editor and open a level instance with external actors.
• Add one static mesh actor (e.g. a cube) in the level instance.
• Create a Packed Level actor with the static mesh. Uncheck the external actor box.
• Delete the Packed level actor in the map.
• Add one static mesh actor (a cube) again.
• Create a Packed level actor with it and overwrite the first one created at step 3.
• A warning should appear. Press Yes.
• Continue to save the packed actor.
• Notice that the actor is far away from the pivot.