custom-fields not syndicating on publish, requires update

[voidzone]

When initially publishing a post, custom fields, such as the ones used by Yoast SEO, are not syndicated out. However, if you then update the post they get sent.

Quick and dirty code used for testing:

function output_syndication($remotePost, $postId) {
	
	ob_start();
	print_r($remotePost);
	$send = ob_get_clean();
	wp_mail('email@example.com', 'syndicate test', $send);
	return $remotePost;
}
add_filter('syndicate_post_content', 'output_syndication', 10, 2);

Publish output

Array
(
    [post_type] => post
    [post_date_gmt] => IXR_Date Object
        (
            [year] => 2017
            [month] => 11
            [day] => 28
            [hour] => 12
            [minute] => 53
            [second] => 27
            [timezone] => 
        )

    [post_content] => words
    [post_title] => syn test new
    [post_excerpt] => 
    [post_status] => publish
    [comment_status] => closed
    [ping_status] => closed
    [post_password] => 
    [custom_fields] => Array
        (
            [0] => Array
                (
                    [key] => _encloseme
                    [value] => 1
                )

            [1] => Array
                (
                    [key] => _pingme
                    [value] => 1
                )

        )

    [terms_names] => Array
        (
        )

)

Update output:

Array
(
    [post_type] => post
    [post_date_gmt] => IXR_Date Object
        (
            [year] => 2017
            [month] => 11
            [day] => 28
            [hour] => 12
            [minute] => 54
            [second] => 06
            [timezone] => 
        )

    [post_content] => words 2
    [post_title] => syn test new
    [post_excerpt] => 
    [post_status] => publish
    [comment_status] => closed
    [ping_status] => closed
    [post_password] => 
    [custom_fields] => Array
        (
            [0] => Array
                (
                    [key] => _encloseme
                    [value] => 1
                )

            [1] => Array
                (
                    [key] => _genesis_scripts_body_position
                    [value] => bottom
                )

            [2] => Array
                (
                    [key] => _pingme
                    [value] => 1
                )

            [3] => Array
                (
                    [key] => _yoast_wpseo_canonical
                    [value] => https://example.com/syn-test/
                )

            [4] => Array
                (
                    [key] => _yoast_wpseo_content_score
                    [value] => 30
                )

            [5] => Array
                (
                    [key] => _yoast_wpseo_primary_category
                    [value] => 
                )

        )

    [terms_names] => Array
        (
        )

)