[Waiting for user feedback] Have languages that are duplicates from others

add_action( 'wp_insert_post', 'my_duplicate_on_publish' );
function my_duplicate_on_publish( $post_id ) {
    global $post;

    // Don't save for autosave or null post
    if (is_null($post)) {
        return $post_id;
    }

    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
        return $post_id;
    }

    // Don't save for revisions
    if ( isset( $post->post_type ) && $post->post_type == 'revision' ) {
        return $post_id;
    }

    // Remove this action to avoid recursion
    remove_action( 'wp_insert_post', 'my_duplicate_on_publish' );

    // Check if the post already has a translation in 'es-mx'
    $is_translated_in_es_mx = apply_filters( 'wpml_element_has_translation', '', $post_id, 'es-mx' );

    if ( !$is_translated_in_es_mx ) {
        // Create duplicate in 'es-mx'
        do_action( 'wpml_admin_make_post_duplicates', $post_id );
        
        // Set the language for the duplicate
        do_action( 'wpml_set_element_language_details', [
            'element_id' => $post_id,
            'element_type' => 'post_' . $post->post_type,
            'trid' => wpml_get_content_trid( 'post_' . $post->post_type, $post_id ),
            'language_code' => 'es-mx',
            'source_language_code' => 'es'
        ] );
    }

    // Re-hook this action
    add_action( 'wp_insert_post', 'my_duplicate_on_publish' );

    return $post_id;
}

if ( $post->post_type !== 'post' && $post->post_type !== 'page' ) {
    return $post_id;
}