Why is the FacetWP request not working correctly?

Question

WordPress

Hello. I'm using the facetwp plugin for custom post filtering and sorting.
The code is the following:

<?php
$term_query = get_term_by( 'slug', get_query_var( 'term' ), 'tours_locations' ); 

return array(
     'post_type' => 'tours',
     'publish' => true,
     'posts_per_page' => 50
     'tax_query' => array(
        array(
            'taxonomy' => 'tours_locations',
            'field'    => 'slug',
            'terms'    => $term_query->slug,
        ),
    )
);

If I pass the term dynamically:
$term_query->slug
then the results on the page are displayed normally, but when you select any option in the result filter, 0, while the address bar is substituted with get parameters, and if you refresh the page, the selection will work correctly.
If I pass the term directly like this:

array(
            'taxonomy' => 'tours_locations',
            'field'    => 'slug',
            'terms'    => 'russia',
        ),

then everything works properly and when you select an option in the filter, everything is immediately displayed and not buggy.
What's the catch? when I pass it dynamically, the string is passed as expected.
Plugin: https://facetwp.com/documentation/