Laravel 5.4 session is not being set if dd method is used

I am using laravel 5.4. In a method of a controller I have setting a value in session. If I call the dd() right after setting the session the dd() is showing all the session with the session I have just set. But if I fetch the session from another method the session is not available. If I remove the dd() from session setter method, I am getting the session properly.

My Code is as below:

public class TestController{
  public function setSession(){
    session(['test_key' => 'test_value']);//setting up the session
    dd(session()->all());//getting the session properly here
  }

  public function showSession(){
    dd(session()->all());//Here we are not getting the session
  }
}

If we remove the dd() from setSession() session. Is it a bug of Laravel or it's intentional. I am interested to know the root cause of this fact. Thanks

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