JoomShoping Why doesn't advanced feature search work?

Question

Joomla

Put the search module (standard), it works. There is a button to go to advanced search.
This page has all sorts of things like price ranges, dates, sections, and features.
The choice of characteristics does not affect the search in any way, it shows all products. the required values ​​are passed to $_POST.
Nobody faced it?
UPD
File components/com_jshopping/models/searchrequest.php $post['extra_fields'] is not passed to the code

public function getExtraFields(){
    $jshopConfig = JSFactory::getConfig();
    if ($jshopConfig->admin_show_product_extra_field){
            if (isset($post['extra_fields'])) 
                $extra_fields = $post['extra_fields'];
            else
                $extra_fields = array();
            $extra_fields = filterAllowValue($extra_fields, "array_int_k_v+");
        }else{
      $extra_fields = array();
    }
    return $extra_fields;
  }

In Joomla, the $post variable somewhere does not properly handle getting $_POST

Answer 1

In general, it was necessary to replace $post['extra_fields'] with $this->request['extra_fields']