Update Actor will not update scene if object is deleted in original scene

Have a Rhino scene with 2 objects

Import in Unreal using the Datasmith Cad importer

Back in rhino

Delete an object

Save

In unreal re import 

Select datasmith scene actor in world outliner

Update actor scene - re-spawn deleted actor

Expected result: object is delete

Actual result: nothing happen

Fix UE-51650

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