CodeIgniter 3.1.4-3.1.5 HTTP Session issue

No database, no file. Just this code

<?php
  class Test extends CI_Controller {  

     public function index() {
        echo "This is default function.";
     }
 
     public function hello() {
        echo "This is hello function.";
     }
  }
?>
What I mean by session: you enter a url and making an http request. Server (Apache 2.4  on windows machine in this case) responds to your request and closes the connection (https://developer.mozilla.org/en-US/docs...TP/Session).

THE PROBLEM: When I try the same code from v3.1.4 it is executed OK (HTTP/1.1 200 OK) but for v3.1.5 it continues to wait for the session to close (like circling sign where the favicon resides on the browser).

Note: I do not use the "?>" sign for my files (as described in https://codeigniter.com/user_guide/gener...e.html#id5 ).