Inconsistent warning with actor root component mobility setting

When an actor class sets the root component mobility to Static or Stationary, spawning an instance of the class (or child blueprint) during runtime will print a warning message in the output log of

"PIE:Warning: Warning Mobility of [ClassActor]: MyScene has to be 'Movable' if you'd like to move."

This is inconsistent with an actor blueprint where setting the root component mobility to non-movable does not print this warning on spawn.

1. Open UE4 Editor
2. Add class to project based on Actor (MyActor)
3. Add the following to MyActor.h:

   	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Test)
   		USceneComponent* MyScene;
   

4. Add the following to MyActor.cpp in the constructor:

   	MyScene = CreateDefaultSubobject<USceneComponent>(TEXT("MyScene"));
   	RootComponent = MyScene;
   	MyScene->SetMobility(EComponentMobility::Stationary);
   

5. Compile
6. Add new blueprint based on PlayerController (MyPCBP)
7. Add key press event node and Spawn Actor from Class node
8. Set Class to MyActor
9. Drag off from Spawn Transform node and create Make Transform node
10. Add blueprint based on GameMode
11. Set Default Player Controller to MyPCBP
12. PIE
13. Press bound key press button

Result:
Warning message is printed to the output

Expected:
1) Setting mobility in code does not print a message to mirror blueprints
2) Setting mobility in blueprints does print a message to mirror code.

[UE-23848] Bug Status

Fix UE-51650

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