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I want to how sticky posts on category pages and I am using a code on my function.php file in order to manage it.

The sticky posts are being shown on the category pages, everything is OK.

But with this code, for some reason, when I access to a page that is expected to show a 404 error message, it show the blog page.

Example:

If I access to example.com/fake-page it shows the same content I would see on example.com/blog

Something weird I noted is that if I go to example.com/real-category/fake-post or example.com/fake-category/postit correctly shows the 404 page as is expected.

My permalink configuration is /%category%/%postname%.

Here is my code:

function get_term_sticky_posts()
{ 
    // First check if we are on a category page, if not, return false
    if ( !is_category() )
        return false;

    // Secondly, check if we have stickies, return false on failure
    $stickies = get_option( 'sticky_posts' );

    if ( !$stickies )
        return false;

    // OK, we have stickies and we are on a category page, continue to execute. Get current object (category) ID
    $current_object = get_queried_object_id();

    // Create the query to get category specific stickies, just get post ID's though
    $args = [
        'nopaging' => true,
        'post__in' => $stickies,
        'cat' => $current_object,
        'ignore_sticky_posts' => 1,
        'fields' => 'ids'
    ];
    $q = get_posts( $args );

    return $q;
}

add_action( 'pre_get_posts', function ( $q )
{
    if (    !is_admin() // IMPORTANT, make sure to target front end only
         && $q->is_main_query() // IMPORTANT, make sure we only target the main query
         && $q->is_category() // Only target category archives
    ) {
        // Check if our function to get term related stickies exists to avoid fatal errors
        if ( function_exists( 'get_term_sticky_posts' ) ) {
            // check if we have stickies
            $stickies = get_term_sticky_posts();

            if ( $stickies ) {
                // Remove stickies from the main query to avoid duplicates
                $q->set( 'post__not_in', $stickies );

                // Check that we add stickies on the first page only, remove this check if you need stickies on all paged pages
                if ( !$q->is_paged() ) {

                    // Add stickies via the the_posts filter
                    add_filter( 'the_posts', function ( $posts ) use ( $stickies )
                    {   
                        $term_stickies = get_posts( ['post__in' => $stickies, 'nopaging' => true] );

                        $posts = array_merge( $term_stickies, $posts );

                        return $posts;
                    }, 10, 1 );
                }
            }
        }
    }
});

I need to find some fix to show the 404 when the page does no exist.

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The solution was to replace:

if (    !is_admin() // IMPORTANT, make sure to target front end only
     && $q->is_main_query() // IMPORTANT, make sure we only target the main query
     && $q->is_category() // Only target category archives
) {

for:

if (    !is_admin() // IMPORTANT, make sure to target front end only
     && $q->is_main_query() // IMPORTANT, make sure we only target the main query
     && $q->is_category() // Only target category archives         
     && $q->is_tax(get_query_var ( 'category_name')) // Only target existing category names 
){

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