phalcon\loader - singular vs plural namespaces loading problem

I found a bug in a phalcon project I have been working on that was hard to troubleshoot because it happenns only in the testing environment (there are a few differences between the centos environments: may be phalcon versions or apache versions but I am assuming that they are not the reason). So the problem is that a file is not found, because of a missing "s" in the "Controller" namespace registration.

This is the file where the namespaces are registered (note the App\Front\Controller missing the "s" at the end)

//File1

$loader->registerNamespaces(
    array(
        'App\Front\Controller'             => MODULES_PATH.'/front/controllers/',
        'App\Front\Model'                   => MODULES_PATH.'/front/models/',
        'App\Front\Validator'               => MODULES_PATH.'/front/validators/',
        'App\Front\Service'                 => MODULES_PATH.'/front/services/'
    )
);
$loader->register();

Then there is a file where, after loading the above one, meaning after having the loader registered, there is some dispatcher forwarding happening as below:

//File2

$this->dispatcher->forward(array(
    "namespace" => "App\\Front\\Controllers",
    "controller"=> $this->getControllerName(),
    "action"    => $forwardAction
    )
);

While this is one of the controllers that is being requested and is found/loaded/returned, except for in my testing machine.

//File3

namespace App\Front\Controllers;

class SomeController extends \Phalcon\Mvc\Controller {

}

So basically changing the first key in the registerNamespaces() method in File1 from 'App\Front\Controller' to 'App\Front\Controllers' in my development environment (the working scenario) does not make a difference at all. The controller class/file is loaded in both cases and php does not bark about file not being found. If I change "App\Front\Controllers" to "App\Front\Controller" in either File2 or File3, then all the references to that namespace must be in singular in all the three files otherwise it won't work.

So I am puzzled as to why this is happening? Is there some type of magical internal implementation in the registerNamespaces() method that checks for the plural of a word/noun as well (it's the only thing I can think of) or is there something else that I am not seeing?

p.s. Fixing my testing environment, required simply appending another "s" to the 'App\Front\Controller' in File1.