Setting Multiple Blocks To False Not Working

Hi

I have a few blocks setup and when setting the 'multiple' option to false ('multiple' => false) it does not restrict the block as described here https://docs.metabox.io/extensions/mb-blocks/#multiple I can add more than one block per page/post and save it. Im using WordPress 6.0.1 and latest version of blocks addon.

add_filter( 'rwmb_meta_boxes', function( $meta_boxes ) {
	$meta_boxes[] = [
		'title'           => 'Product Listing Block',
		'id'              => 'dc-product-listing-block',
		'description'     => 'Product listing layouts for your store',
		'type'            => 'block',
		'icon'            => 'screenoptions',
		'category'        => 'dc-blocks',
		'context'         => 'side',
		'render_template' => __DIR__ . '/template/dc-product-listing-block-template.php',
		'supports' => [
			'align' => ['wide', 'full'],
		],
		'keywords' 		  => ['product', 'listing', 'ecommerce'],
		'multiple' 		  => false,
		'reusable' 		  => false,
		'preview' => [
			'image'       => '', // Image ID
			'title'       => 'Product Block',
			'description' => 'Product listing layout block',
		],
		'fields' => [
			[
				'type' => 'number',
				'id'   => 'per_page',
				'name' => 'Posts per page',
				'min'  => 1,
				'max'  => 100, //max of 100 (WP API only supports this by default)
				'required' => true,
				'std'  => 10, 
			]
		],
	];
	return $meta_boxes;
} );