Custom endpoint – Only get one entry

Hi! Great plugin! Great job you’ve done!
I need a bit of help in using it with custom endpoints though..
Can I use custom endpoints like /products/(?P<id>[\d]+) ? How do I do that correctly?
Here’s how I register my rest route:

function cc_register_rest_routes() {
    register_rest_route( 'cc-rest/v1', '/products/(?P<id>[\d]+)', array(
        'methods'  => WP_REST_Server::READABLE,
        'callback' => 'cc_rest_get_product',
    ) );
}

Now when I use this:

function my_add_products_endpoints_to_cache( $allowed_endpoints ) {
    if ( ! isset( $allowed_endpoints[ 'cc-rest/v1' ] ) || ! in_array( 'products', $allowed_endpoints[ 'cc-rest/v1' ] ) ) {
        $allowed_endpoints[ 'cc-rest/v1' ][] = 'products';
    }
    return $allowed_endpoints;
}
add_filter( 'wp_rest_cache/allowed_endpoints', 'my_add_products_endpoints_to_cache', 10, 1);

I only get the first record cached, eg. /cc-rest/v1/products/176.
All other requests ‘…/175’ , ‘…/181’ etc. are not.
And even if I delete the only cache record, the new ones don’t appear (or the old one reappear btw).
Thanks.

P.S. So far I’ve been trying this on a local server only so can’t provide a link