Named route in nested route group does not exists

[odan]

If I add a route within a route group, the route cannot be resolved by name.

Example

use League\Route\RouteGroup;
use League\Route\Router;

$router = new League\Route\Router();

$router->group('', function (RouteGroup $group): void {
    $group->get('/', \App\Action\HomeIndexAction::class)->setName('root');
});

// A quick test
$router->getNamedRoute('root');

Error message: No route of the name (root) exists

This is just a minimal example. In reality I have much more named routes. The problem is, they cannot be found if the name is defined in a route group.