Ros2: Subscriber listens to messages while LifecycleNode is unconfigured or inactive.

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I want a lifecycle node to receive messages only when it is on the active state. According to the Managed States page, a node executes callbacks during the active state. But in the next sample code it executes the subscriber callback during the unconfigured state.

#include <chrono>
#include "rclcpp/rclcpp.hpp"
#include "rclcpp_lifecycle/lifecycle_node.hpp"
#include "rclcpp_lifecycle/lifecycle_publisher.hpp"
#include "std_msgs/msg/bool.hpp"

using namespace std::chrono_literals;

class Subscriber : public rclcpp_lifecycle::LifecycleNode{
  rclcpp::Subscription<std_msgs::msg::Bool>::SharedPtr sub;
public:
  explicit Subscriber(const std::string & node_name, bool intra_process_comms = false)
  : rclcpp_lifecycle::LifecycleNode(node_name, "", intra_process_comms){
    sub = this->create_subscription<std_msgs::msg::Bool>(
      "bool",
      [this](std_msgs::msg::Bool::UniquePtr msg) {
      RCLCPP_INFO(this->get_logger(), "Received: '%i'", msg->data)
    });
  }
};

class Publisher : public rclcpp::Node{
  rclcpp::TimerBase::SharedPtr timer;
  rclcpp::Publisher<std_msgs::msg::Bool>::SharedPtr pub;
public:
  explicit Publisher(const std::string & node_name) : Node(node_name)
  {
    pub = this->create_publisher<std_msgs::msg::Bool>("bool");
    auto timer_callback =
      [this]() -> void {
        auto message = std_msgs::msg::Bool();
        message.data = true;
        RCLCPP_INFO(this->get_logger(), "Sent")
        this->pub->publish(message);
      };
    timer = this->create_wall_timer(1s, timer_callback);
  }
};

int main(int argc, char * argv[])
{
  setvbuf(stdout, NULL, _IONBF, BUFSIZ);
  rclcpp::init(argc, argv);
  rclcpp::executors::SingleThreadedExecutor exec;
  auto pub = std::make_shared<Publisher>("test_pub");
  exec.add_node(pub);
  auto sub = std::make_shared<Subscriber>("test_sub");
  exec.add_node(sub->get_node_base_interface());
  exec.spin();
  rclcpp::shutdown();
  return 0;
}

Is it the expected behavior? What can i do in order to achieve it? Thanks.