Overlap Events Stop Firing When Actor is Moved to a Different Level

Overlap events, such as OnComponentBeginOverlap seem to stop working when the actor is moved to a sub level. This does not occur if the object is deleted and then replaced in the level.

1. Open the editor (First Person Template)
2. Create a new C++ class based on Actor called OverlapActor
3. Add this code to OverlapActor.h

   UFUNCTION()
   	void OnOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);
   
   	UBoxComponent* BoxCollision;
   
   	UStaticMeshComponent* OverlapMesh;

4. Add this code to OverlapActor.cpp

   AOverlapActor::AOverlapActor()
   {
    	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
   	PrimaryActorTick.bCanEverTick = true;
   
   	BoxCollision = CreateDefaultSubobject<UBoxComponent>(TEXT("Box Collision"));
   	SetRootComponent(BoxCollision);
   	BoxCollision->OnComponentBeginOverlap.AddDynamic(this, &AOverlapActor::OnOverlap);
   	BoxCollision->bGenerateOverlapEvents = true;
   
   	OverlapMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));
   
   	static ConstructorHelpers::FObjectFinder<UStaticMesh> Mesh(TEXT("/Game/Geometry/Meshes/1M_Cube.1M_Cube"));
   	if (Mesh.Succeeded())
   	{
   		OverlapMesh->SetStaticMesh(Mesh.Object);
   	}
   	OverlapMesh->AttachToComponent(RootComponent, FAttachmentTransformRules::KeepRelativeTransform);
   	OverlapMesh->SetWorldScale3D(FVector(.25, .25, .25));
   
   }
   
   void AOverlapActor::OnOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
   {
   	Destroy();
   
   }

5. Compile
6. Back in the editor, add an instance of your C++ class to the level
7. Create a new level
8. Open the Levels window, and add the new level as a sub level of FirstPersonExample map
9. PIE and run into the object to ensure overlap is working
10. Exit PIE
11. Select the OverlapActor in the level
12. In the Levels window, right-click on the sub level and select the Move Selected Actors to Level option
13. Ensure the sub level is set to Always Loaded for its streaming method
14. PIE and run into the Overlap Actor again

Result: The overlap event no longer works when the object is moved to a sub level

Expected: The overlap event would continue to fire

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