How to properly set custom prefix in url OpenCart 3 (SeoPro plugin)?

Question

opencart

CMS ocStore 3.0.2.0.
It's not the first day I've been trying to solve the problem with adding product categories of the format -
domain.com/ category /item and domain.com/ category/subcategory /item
- an arbitrary prefix, say "katalog".
To get the following:
domain.com/ katalog / category / and domain.com/ katalog / category/subcategory /item
Previously, on version ocStore 2.3, this issue was resolved elementarily:

catalog/controller/startup/seo_pro.php

case 'path':  // Найдите этот блок и пропишите как тут
  $categories = explode('_', $value);
  $queries[] = 'category_suffix';
  $queries[] = 'category_id=' . end($categories);
  unset($data[$key]);
  break;

В менеджере SEO_URL добавьте  category_suffix = katalog

For ocStore 3, I did not find a solution. If I use the code above, I get "katalog" added before the categories, but the pages themselves become unavailable (404 error). The file is being edited at /system/library/seopro.php
I have already rummaged through tons of information on the second version, but I could not find any hints or clues for my case on the Internet =(
Please direct my searches in the right direction)