USceneComponent details pane is empty?

Development Programming & Scripting Blueprint
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2

I’m trying to add a USceneComponent to my Actor heirarchy, attached to the mesh to specify some positions for projectile starting points.

.h

UCLASS()
class ASTEROIDS_API AMySpaceship : public APawn
{
     GENERATED_BODY()
    ....
public:
    UPROPERTY(VisibleAnywhere, Category = "Components")
    USphereComponent* CollisionComp;

     UPROPERTY(VisibleAnywhere, Category = "Components")
     UStaticMeshComponent *MeshComp;

     UPROPERTY(VisibleAnywhere, Category = "Components")
     USceneComponent *GunPositionComp;
}

.cpp

AMySpaceship::AMySpaceship()
{
	CollisionComp = CreateDefaultSubobject<USphereComponent>(TEXT("CollisionComp"));
	CollisionComp->SetCollisionEnabled(ECollisionEnabled::NoCollision);
	CollisionComp->SetHiddenInGame(true);
	RootComponent = CollisionComp;

	MeshComp = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("MeshComp"));
	MeshComp->SetCollisionEnabled(ECollisionEnabled::NoCollision);
	MeshComp->SetupAttachment(CollisionComp);

	GunPositionComp = CreateDefaultSubobject<USceneComponent>(TEXT("GunPositionComp"));
	GunPositionComp->SetupAttachment(MeshComp);
}

However, in the editor the Component appears in the object heirarchy, but it’s entirely un-editable… it’s details pane is empty and it doesn’t appear in the viewport at all.

I eventually found it in the ClassDefaults pane before you open the full blueprint editor, but it’s just a white box with “none” in it. There is no way to edit it. All the other components appear as expected.

Does anyone know why the USceneComponent isn’t editable?