protected virtual void OnDisable() => SubsystemBehaviour <TSubsystem> .Unregister(this);
protected virtual void OnEnable() => SubsystemBehaviour <TSubsystem> .Register(this);
protected virtual void OnDisable() => SubsystemBehaviour <TSubsystem> .Unregister(this);
protected virtual void OnEnable() => SubsystemBehaviour <TSubsystem> .Register(this);