Customized meta field is just not exhibiting up underneath nav-menus.php web page

I’ve created a category so as to add customized meta bins for my web site, and it really works completely nice after I add it to pages, however nothing is exhibiting up after I go to the nav-menus web page.

//provides choice to edit nav menu
operate register_my_menu() {
    register_nav_menus(['nav-menu' => "Navigation Menu"]);
}

add_action('init', 'register_my_menu');

//class that provides customized inputs to pages
class reflection_page_edit {

    non-public $htmlcontent;
    non-public $ID;
    non-public $metaid;
    non-public $page_location;
    

    public operate __construct($title, $htmlcontent, $page_location) {
        $this->htmlcontent = $htmlcontent;
        $this->page_location = $page_location;
        $this->ID = str_replace(' ', '_', $title);
        $this->metaid = "wp".$this->ID;
        world $submit;

        add_action( 'admin_init', [$this, 'addmetabox']);
        add_action( 'save_post', [$this, 'savethispost']);
    }

    public operate addmetabox() {
        add_action( 'add_meta_boxes', [$this, 'create_meta_box']);
    }

    public operate create_meta_box() {
        add_meta_box($this->ID, str_replace('_',' ',$this->ID), [$this, $this->htmlcontent], $this->page_location, 'facet');
    }

    public operate image_uploader() {
        
        world $submit;
        $post_id = $post->ID;
        $input_id = "custom_img_id".$this->ID;
        $picture = get_post_meta( $post_id, $this->metaid, true);
        $image_source = wp_get_attachment_image_src( $picture, 'full');

        

        ?>
        <div class="custom-img-container">
            <img class=<?php echo "thumbnail".$input_id;?> src=<?php echo $picture; ?> alt="" model="max-width:100%;" />
            <p class="error_message" model="font-size: 1.5rem; font-weight: bold; <?php if ($image): ?> visibility: hidden; <?php endif ?>">No Picture Chosen.</p>
         </div>
            <a href="#" class="reflection_image_uploader" data_title=<?php echo $this->ID;?>>Select Picture</a>
            <enter id=<?php echo $input_id;?> title=<?php echo $input_id;?> kind="hidden" worth="<?php echo esc_attr($image); ?>"/>
        <?php
    }

    public operate savethispost() {
        world $submit;
        $post_id = $post->ID;
        $input_id = "custom_img_id".$this->ID;
        update_post_meta( $post_id, $this->metaid, $_POST[$input_id]);
    }

}


new reflection_page_edit('Hero Picture', 'image_uploader', ['page']);
new reflection_page_edit('New Factor', 'image_uploader', ['page']);
new reflection_page_edit('Model Picture', 'image_uploader', ['nav-menus']);

Right here is the nav-menus web page with no customized field