Configuration Issue ZF2

zf2.php

/*
* I have 4 modules which are well loaded
*/

// Action called
public function indexAction() {
    $this->layout('layout/default');
    
    return [
        'isWelcomePage' => true,
        'form' => new LoginForm()
    ];
}

// In the view index.phtml
<?php var_dump($this->isWelcomePage); // I get null ?>

/*
* If I disable 3 other modules and I only this module, eveything works fine.
*/