If converter depends on parameters provided for form field configuration it will always take parameters from the first field of the same type, which is wrong.

Steps to reproduce:

1. Create a custom Form field like shown in the documentation https://doc.ibexa.co/en/3.3/guide/form_builder/create_custom_form_field/.
   with minor change:

   ez_platform_form_builder:
       fields:
           country:
               name: Country
               category: Custom form fields
               thumbnail: '/bundles/ibexaplatformicons/img/all-icons.svg#places'
               attributes:
                   parameter:
                       type: integer
                       name: Parameter
                   label:
                       name: Display label
                       type: string
                       validators:
                           not_blank:
                               message: You must provide a label for the field
                   help:
                       name: Help text
                       type: string
               validators:
                   required: ~
   

   (adding parameter attribute).

2. Create a Form with two newly created fields and set parameter values to 1 and 2 respectively and one submit button.
3. In vendor/ezsystems/ezplatform-form-builder/src/lib/FormSubmission/FormSubmissionService.php file on line 78 add the following:

   $parameter = $field->getAttribute('parameter');
   dump($parameter);
   

4. Submit the form and observe the dump results.

Result:
The parameter values is always 1.

Expected result:
The parameter values should be 1 and 2 respectively.