Can't get terms' meta values in frontend

Hello,
I bought the full bundle of your plugins and have encountered a difficulty with the term meta one.
I installed the metabox plugin, then the extension, registered the term meta for category featured image just like in the example you provide.
I then created a new category and uploaded a picture. On the admin side it all looks OK.
Now, in order to query the terms I created a new page called 'Categories' and used a customized template called 'Categories' for it.

I'm using the most recent versions of both wordpress and metabox.io.

The php for my page looks like this:

<?php /* Template name: Categories */ ?>
<?php 

get_header();

$cats = get_terms('category');

foreach ($cats as $cat) {
	
	var_dump($cat);
	echo '<br><br>';

	echo $cat->name; //yields correct category name
	echo '<br><br>';

	$meta = get_term_meta( $cat->$term_id, 'image_advanced', false );
	var_dump($meta); //yields FALSE
	echo '<br><br>';	

	$meta2 = get_term_meta( $cat->$term_id, 'color', true );
	var_dump($meta2); //yields FALSE
	echo '<br><br>';	

	$a = get_metadata( 'category', $cat->$term_id, 'image_advanced', false );
	var_dump($a); //yields FALSE
	echo '<br><br>';

	echo rwmb_meta( 'image_advanced', $args, $cat->$term_id );
	echo rwmb_meta( 'color', $args, $cat->$term_id );

	$images = rwmb_meta( 'image_advanced');            // Since 4.8.0
	//$images = rwmb_meta( 'image_advanced', 'type=image_advanced' ); // Prior to 4.8.0
	if ( !empty( $images ) ) {
	    foreach ( $images as $image ) {
	        echo "<a href='{$image['full_url']}' rel='lightbox'><img src='{$image['url']}' width='{$image['width']}' height='{$image['height']}' alt='{$image['alt']}' /></a>";
	    }
	}
}

// Restore original Post Data
wp_reset_postdata();

?>

<?php get_sidebar(); ?>
<?php get_footer(); ?>

As you can see, I tried a few options there...
All I get for the dumps of the meta is FALSE.

Please advise - how do I properly show the image/color in the front end?

This is my metabox registration code:

add_action( 'rwmb_meta_boxes', 'prefix_register_taxonomy_meta_boxes' );
function prefix_register_taxonomy_meta_boxes( $meta_boxes )
{
	$meta_boxes[] = array(
		'title'      => 'Standard Fields',
		'taxonomies' => 'category', // List of taxonomies. Array or string
		'fields' => array(
			array(
				'name' => __( 'Featured Image', 'prefix' ),
				'id'   => 'image_advanced',
				'type' => 'image_advanced',
			),
			array(
				'name' => __( 'Color', 'prefix' ),
				'id'   => 'color',
				'type' => 'color',
			),
		),
	);
	return $meta_boxes;
}