Custom ActorComponent's children being parented to world instead of components owner

Development Programming & Scripting C++
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5

BeginPlay is too late to do this. You need to call this right after creating the default subobject.
At least, that’s what the documentation page says:

Initializes desired Attach Parent and SocketName to be attached to when the component is registered

But, like, just open up Lyra and see how they do it there:

ALyraWeaponSpawner::ALyraWeaponSpawner()
{
 	// 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;

	RootComponent = CollisionVolume = CreateDefaultSubobject<UCapsuleComponent>(TEXT("CollisionVolume"));
	CollisionVolume->InitCapsuleSize(80.f, 80.f);
	CollisionVolume->OnComponentBeginOverlap.AddDynamic(this, &ALyraWeaponSpawner::OnOverlapBegin);

	PadMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("PadMesh"));
	PadMesh->SetupAttachment(RootComponent);

	WeaponMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("WeaponMesh"));
	WeaponMesh->SetupAttachment(RootComponent);

	WeaponMeshRotationSpeed = 40.0f;
	CoolDownTime = 30.0f;
	CheckExistingOverlapDelay = 0.25f;
	bIsWeaponAvailable = true;
	bReplicates = true;
}

This should be all you need to do, assuming everything else is handled correctly. (Again – read through the Lyra code. It shows many things!)

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