[PS 8] Grid reset button not working

[rreimche]

This is a part of a bigger problem, as I have found out here.

-----------------------------

Hi, I am making a grid in prestashop 8 using this guide. The form is generally working, but the reset button is not. As the tutorial says, I have added this filter to my grid definition:

 

->add((new Filter('actions', SearchAndResetType::class))
                ->setAssociatedColumn('actions')
                ->setTypeOptions([
                    'reset_route' => 'admin_common_reset_search_by_filter_id',
                    'reset_route_params' => [
                        'filterId' => self::GRID_ID,
                    ],
                    'redirect_route' => 'admin_pwswkbl_list',
                ])
            )

As far as I understand, I don't need to define the specified route myself. 

This is what Prestashop generates to show the button:

 

<div class="js-grid-reset-button">
  <button type="reset" name="course_list[actions][reset]" class="btn btn-link js-reset-search btn d-block grid-reset-button" data-url="/admin-dev/index.php/common/reset_search/course_list?_token=ooPhgOvN8rhNQEQ7UPu68Q_3LiTRpD581hVS4Y4AGe8" data-redirect="/admin-dev/index.php/modules/kursanmeldungen?_token=ooPhgOvN8rhNQEQ7UPu68Q_3LiTRpD581hVS4Y4AGe8"><i class="material-icons">clear</i>
              Reset
  </button>
</div>

 

The reset button is just not working in any sense -- when I click it, nothing happens. I've already rechecked everything I could, asked LLMs and searched the web.
 

 I also see no javascript errors. And when I open the URL given in data-url attribute of the button I get 

Quote

Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException: No route found for "GET /common/reset_search/course_list": Method Not Allowed (Allow: POST)

So it seems that the route is there, but only for POST.

I'd be grateful for any help. 

Thank you in advance.

Edited June 18 by rreimche (see edit history)