Instance of BP actor remains in Viewport after undoing create actor

I was only able to reproduce this with BP actors. In the attached image I also tried to do it with a Basic > Cone, but was not able to repro it.

In the instance of the warning above I used BP_AnimBP_Perf asset in QAGame.

I was unable to repro this on a binary build in //UE4/Release-4.15 @ CL 3403743

Repro:

1. Add an instance of a BP actor to the Viewport.
2. Ctrl+z to undo placing the actor.
3. Try to click on "BP Actor" in the Viewport.

Result:
After undoing the create actor, the actor is still in the Viewport. Clicking on the actor generates a warning of

LogEditorSelectUtils:Warning: SelectActor: The requested operation could not be completed because the actor has invalid flags. (BP_AnimBP_Perf26)

Expected:
Undoing the create actor removes instance from Viewport.

Fix UE-51650

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