<?php
// Details: https://wordpress.stackexchange.com/questions/319884/possible-bug-where-is-replaced-by-20-in-querystring-when-in-pagination-page

// Add this to the theme's functions.php file. And this code cancels canonical
// redirect when the query string `specialties` exists in the requested URL.
if ( isset( $_GET['specialties'] ) ) {
    remove_action( 'template_redirect', 'redirect_canonical' );
}