Parameters in url brake the page (404) on Nginx, on FastCGI - no, but can't access BO

[Skafander]

Hi, I bought template with elementor, wchich needs work at it. Developer is telling me our website don't process links with parameteres, but we export our products to Merchant Center, and there links have currency parameter in it. Search also works...

 

Nevermind, he told me that my website need to process links like this - xxx.com/en/index.php?test=1. On Nginx this ends with 404 error. On FastCGI such parameter works, but I can't access BO, as instead of login page, index.php is downloaded.#

We are on Prestashop 1.7.8.5 + PHP 7.4

Any clues?