Plugin works but there seems to be some validation and filter issues

I got these errors in Webmaster tool

“The attribute ‘content_max_width’ may not appear in tag ‘amp-carousel'”

“The attribute ‘rel’ in tag ‘a’ is set to the invalid value ‘attachment wp-att-14145′”

And this metadata filter doesn’t seem to make any changes to the $metadata at all

add_filter( 'amp_post_template_metadata', 'xyz_amp_modify_json_metadata', 10, 2 );

function xyz_amp_modify_json_metadata( $metadata, $post ) {
    $metadata['@type'] = 'NewsArticle';

    $metadata['publisher']['logo'] = array(
        '@type' => 'ImageObject',
        'url' => get_template_directory_uri().'/images/logo.png',
        'height' => 60,
        'width' => 600,
    );
    return $metadata;
}

Any fix?

Thanks