How to inherit parent methods with annotation routing?

Using Symfony 3.4. Want to keep all functionality in parent abstract class, and just set the route prefixes in childs:

namespace AppBundle\Controller;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;

abstract class TaskAbstractController extends Controller
{

    /**
     * Lists all Task entities.
     *
     * @Route("/", name="tasks_index")
     * @Method("GET")
     */
    public function indexAction()
    {
        $em = $this->getDoctrine()->getManager();

        $tasks = $em->getRepository($this->getTargetClassName())->findAll();
        return $this->render('@App/' . $this->getPrefix() . '/index.html.twig', array(
            'tasks' => $tasks,
            'delete_forms' => $this->generateDeleteFormsViews($tasks)
        ));
    }

child:

/**
 * Daily task controller.
 *
 * @Route("daily_tasks")
 */
class DailyTaskController extends TaskAbstractController
{

   protected function getPrefix(): string
   {
       return 'daily_task';
   }

    protected function getTargetClassName(): string
    {
        return 'AppBundle:DailyTask';
    }
}

But I get "No route found for "GET /daily_tasks/"" . What's the problem? How to implement my idea? Don't want to duplicate every action with annotations in every child controller.