site_factory_group:
    design: custom
    content_view:
        full:
            folder:
                template: '@ezdesign/full/folder.html.twig'
                match:
                    Identifier\ContentType: [folder] 

{% extends '@ezdesign/pagelayout.html.twig' %}

{% block content %}
    {{ render(controller('App\Controller\TestController::testAction')) }}
{% endblock %} 

<?php

namespace App\Controller;

use Symfony\Component\HttpFoundation\Response;

class TestController
{
    public function testAction(): Response
    {
        return new Response('asd');
    }
} 

[2020-11-10T21:49:37.425389+01:00] php.WARNING: Warning: Cannot bind closure to scope of internal class ReflectionProperty {"exception":"[object] (ErrorException(code: 0): Warning: Cannot bind closure to scope of internal class ReflectionProperty at /Users/kamil/www/ezplatform-v3/var/cache/prod/ContainerOMyJZE6/PublicAccessHandler_4cae68b.php:82)"} []
[2020-11-10T21:49:37.426147+01:00] php.CRITICAL: Uncaught Error: Function name must be a string {"exception":"[object] (Error(code: 0): Function name must be a string at /Users/kamil/www/ezplatform-v3/var/cache/prod/ContainerOMyJZE6/PublicAccessHandler_4cae68b.php:83)"} []
[2020-11-10T21:49:37.437126+01:00] request.CRITICAL: Uncaught PHP Exception Error: "Function name must be a string" at /Users/kamil/www/ezplatform-v3/var/cache/prod/ContainerOMyJZE6/PublicAccessHandler_4cae68b.php line 83 {"exception":"[object] (Error(code: 0): Function name must be a string at /Users/kamil/www/ezplatform-v3/var/cache/prod/ContainerOMyJZE6/PublicAccessHandler_4cae68b.php:83)"} [] 

An exception has been 
thrown during the rendering of a template ("Warning: Cannot bind closure
 to scope of internal class ReflectionProperty").