I have updated my query as shown below. This now pulls the request posts correctly but I am still getting an error on the sortby date. Error shown is:

[orderby] => post_date [order] => DESC [error] => [m] => [p] => 0

I can’t seem to get the sortby to work no matter what i try. Any ideas what I am missing?

    <?php 
    $offspring = $horse->offspring; 
    remove_all_filters('posts_orderby'); // ADDED
    $args = array(
        'post_type'=>'horse',
        'post_status'=>'publish',
        'post__in'=> $offspring,
        'suppress_filters' => true,
        'ignore_custom_sort' => true,
        'orderby' => 'date',
        'order' => 'DESC'
        );
    $off_query = new WP_Query( $args );
?>

        <?php 
            foreach($offspring as $offspring_id){
                while ( $off_query->have_posts()) {
                $off_query->the_post();
                    if($post->ID == $offspring_id){
                        $post = get_post($offspring_id);
                        setup_postdata($post);
                        get_template_part('partials/post','excerpt-offspring');
                    }
                }
            }
        wp_reset_postdata();
            
        ?>

I have confirmed that $off_query is returning the results in the correct order yet my foreach loop is still posting in order of ID and not by date. I’ve been working on this a while and can’t seem to pinpoint the issue.