FCoreUObjectDelegate never called?

Development Programming & Scripting C++
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1

I’m trying to use FCoreUObjectDelegates to determine the state of the UWorld.

FCoreUObjectDelegates::PreLoadMap.AddUObject( this , &ThisClass::HandlePreLoadMap );
FCoreUObjectDelegates::PostLoadMapWithWorld.AddUObject( this , &ThisClass::HandlePostLoadMap );

void HandlePreLoadMap( const FString& InMapName )
{
	bIsWorldFullyLoaded = false;
}
void HandlePostLoadMap( UWorld* InWorld )
{
    if (InWorld) { bIsWorldFullyLoaded = true; }
}

It works perfectly fine in standalone, but in PIE neither delegate is ever called.