Server only world subsystem in PIE

Development Programming & Scripting
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1

Hello everyone!

I have a problem with making server-only subsystem work in PIE.
I’ve created subsystem as a child of UWorldSubsystem. I need it to exist only on server, so I’ve overrided ShouldCreateSubsystem function where I check if world’s net mode is not client, like this:

bool UServerOnlySubsystem::ShouldCreateSubsystem(UObject* Outer) const
{
	if (!Super::ShouldCreateSubsystem(Outer))
	{
		return false;
	}
	
	const UWorld* World = Cast<UWorld>(Outer);
	check(World);
	
	const bool bShouldCreateSubsystem = World->GetNetMode() < NM_Client;
	
	UE_CLOG(bShouldCreateSubsystem, LogTemp, Display, TEXT("Should create subsystem."));
	UE_CLOG(!bShouldCreateSubsystem, LogTemp, Display, TEXT("Should not create subsystem."));
	
	return bShouldCreateSubsystem;
}

When I’m trying to launch several clients in PIE with one of them as a listen server, every instance have net mode as NM_Standalone, so every client has this subsystem created, which is not what I want. Outside of PIE it works just fine.

So my question is - is there a way to correctly determine net mode in subsystem when in PIE? Or am I missing something?

Thanks!