Bug? CI 4 not remove method from params when use routes ?

In CI 3 i use this _remap in MY_Controller and work perfectly for my app.

PHP Code:

public function _remap($method, $params = array()) {
        if ( method_exists($this, $method) ) {
            return call_user_func_array(array($this, $method), $params);
        } elseif ( method_exists($this, 'index') ) {
            $this->router->method = 'index';
            $this->router->uri->rsegments[2] = 'index';
            return call_user_func_array(array($this, 'index'), $params);
        } else {
            show_404();
        }
    } 


For some days i try to find a good solution for this _remap in CI 4 for migrate my app to ci 4. 

Original url: site[.]com/post/seo-url/param1/param2

$routes->add('p(/.*)?', 'Post::index');
$routes->add('post(/.*)?', '404');

After route: site[.]com/p/seo-url/param1/param2
But in CI4 i received empty params after use this route in _remap
In CI3 i received params without method and folders in _remap

I need receive params without method and folders in CI 4 _remap.

Can someone help me please ? Thank you!