Symfony version(s) affected: 4.4.0

Description

ErrorListener doesnt convert throwable to legacy FlattenException for controller argument and it leads to exception:

Argument 1 passed to ExceptionController::__invoke() must be an instance of Symfony\Component\Debug\Exception\FlattenException, instance of TypeError given, called in /.../vendor/symfony/http-kernel/HttpKernel.php on line 146

How to reproduce

Declare controller with Symfony\Component\Debug\Exception\FlattenException argument,
use Symfony\Component\HttpKernel\EventListener\ErrorListener with configured reference to controller.

Possible Solution

Check Symfony\Component\Debug\Exception\FlattenException here

Additional context

DI config:

services:
  exception_error.listener:
  class: Symfony\Component\HttpKernel\EventListener\ExceptionListener
  tags:
    - { name: kernel.event_listener, event: kernel.exception, method: onKernelException, priority: -1 }
  arguments:
    - 'ExceptionController'
    - '@?logger'

Controller example:

use Symfony\Component\Debug\Exception\FlattenException;
use Symfony\Component\HttpFoundation\JsonResponse;

class ExceptionController
{
    public function __invoke(FlattenException $exception): JsonResponse
    {
        return new JsonResponse(['message' => $exception->getMessage(), 'failed' => true]);
    }
}