How to solve 404 pagination problem in Wordpress?

Question

PHP

Hello, the essence of the problem is this:
There is a site on WP, there is a page where the latest news is displayed at 6 pieces per page. WP-Pagenavi plugin installed. On the first page, everything is OK, everything is displayed, but when you go to page 2+ (../news/page/2), the server throws a 404 page. The parsley itself is that I made this shaitan machine work last night, but I made a mistake somewhere and now I can’t solve the problem.
Below is the loop code on the page

<h1><?php the_title(); ?></h1>//Вывод заголовка страницы
      <?php the_content(); ?>
      <?php
      $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
      $id = get_cat_ID( get_the_title() );//Выборка категории идет по заголовку (есть 2 страницы и 2 категории с одинаковым именем и ссылкой)
      $args=array(
        // 'post_type' => $type,
        'post_status' => 'publish',
        'paged' => $paged,
        'posts_per_page' => 6,
        'caller_get_posts'=> 1,
        'cat' => $id
        );
        $temp = $wp_query;
        $wp_query = null;
        $wp_query = new WP_Query();
        $wp_query->query($args);
        ?>
        <?php if($wp_query->have_posts()) : while($wp_query->have_posts()) : $wp_query->the_post(); ?>

//Тело цикла

?php endwhile; ?>
<?php wp_pagenavi(); ?>//Вывод нумерации страниц
<?php endif; ?>

Foreshadowing incoming questions, I will give answers right away:

1. The WP settings have a limit of 5 posts per page (less than in the loop, everything is canon)
   
2. Plugin "Category pagination fix" is installed - it solved the problem last night, but now it doesn't work anymore
   
3. Added code to remove "category" from address bar
   

add_filter('user_trailingslashit', 'remcat_function');
function remcat_function($link) {
    return str_replace("/category/", "/", $link);
}
  
add_action('init', 'remcat_flush_rules');
function remcat_flush_rules() {
    global $wp_rewrite;
    $wp_rewrite->flush_rules();
}
  
add_filter('generate_rewrite_rules', 'remcat_rewrite');
function remcat_rewrite($wp_rewrite) {
    $new_rules = array('(.+)/page/(.+)/?' => 'index.php?category_name='.$wp_rewrite->preg_index(1).'&paged='.$wp_rewrite->preg_index(2));
    $wp_rewrite->rules = $new_rules + $wp_rewrite->rules;
}

The address of permalinks is as follows: %category%/%postname%
The third day I'm sitting on this garbage. Help, please, so no nerves are enough for all this!

Answer 1

Solved the problem like this.
$args = array(
....
'posts_per_page' => 6,
....
query_posts($args);
Settings -> reading -> Display no more than << 6 on blog pages >>
If the numbers match, then everything starts works. I don't know what kind of magic. Solved by poking...

Answer 2

Try passing your query to wp_pagenavi()
wp_pagenavi( array( 'query' => $my_query ) );

Answer 3

https://wordpress.stackexchange.com/questions/2096... helped me
Replace blog with your category name in the code above.
After adding this code, make sure you go to Settings > Permalinks and click Save to flush the rules cache, or else the rule will not be applied.

/**
 * Fix pagination on archive pages
 * After adding a rewrite rule, go to Settings > Permalinks and click Save to flush the rules cache
 */
function my_pagination_rewrite() {
    add_rewrite_rule('blog/page/?([0-9]{1,})/?$', 'index.php?category_name=blog&paged=$matches[1]', 'top');
}
add_action('init', 'my_pagination_rewrite');