Interesting.
I threw together a quick test to try to reproduce, but everything worked as expected (in 5.4.4):
[2024.12.03-16.19.43:083][589]LogTemp: Creating TestSceneComponent
[2024.12.03-16.19.43:083][589]LogTemp: TestSceneComponent Constructed
[2024.12.03-16.19.43:083][589]LogTemp: TestChildSceneComponent parent is now TestSceneComponent (was null)
[2024.12.03-16.19.45:691][738]LogTemp: Destroying TestSceneComponent
[2024.12.03-16.19.45:692][738]LogTemp: TestChildSceneComponent parent is now RootComponent (was TestSceneComponent)
[2024.12.03-16.20.32:091][296]LogTemp: TestSceneComponent Destructed
What version are you using?
Not sure how different out setups are, this is the actor code I was using:
ATestActor::ATestActor() : TestComponent(nullptr), TickCounter(0)
{
PrimaryActorTick.bCanEverTick = true;
USceneComponent *RootComponent = CreateDefaultSubobject<USceneComponent>(TEXT("RootComponent"));
SetRootComponent(RootComponent);
}
void ATestActor::Tick(float DeltaTime)
{
Super::Tick(DeltaTime);
++TickCounter;
if (TickCounter == 1) {
UE_LOG(LogTemp, Log, TEXT("Creating TestSceneComponent"));
TestComponent = NewObject<UTestSceneComponent>(this, TEXT("TestSceneComponent"));
TestComponent->RegisterComponent();
TestComponent->AttachToComponent(GetRootComponent(), FAttachmentTransformRules::KeepRelativeTransform);
UTestChildSceneComponent *TestChildComponent = NewObject<UTestChildSceneComponent>(this, TEXT("TestChildSceneComponent"));
TestChildComponent->RegisterComponent();
TestChildComponent->AttachToComponent(TestComponent, FAttachmentTransformRules::KeepRelativeTransform);
} else if (TickCounter == 150) {
UE_LOG(LogTemp, Log, TEXT("Destroying TestSceneComponent"));
TestComponent->DestroyComponent();
TestComponent = nullptr;
}
}
TestSceneComponent just logs in ctor/dtor.
TestChildSceneComponent just constantly checks it parent and logs changes.