E-mail in the default template sends only content without defined blocks

Hi!

I have a defined function in functions.php that sends a notification to an e-mail after a custom type is updated (I’m sending a preview below). I set a default template within your plugin, where in addition to the “content” element, I also added a “block” for the header and for the footer – these are blocks that I defined so that I don’t have to create them anew in every e-mail. In all e-mail notifications for WooCommerce they work, unfortunately, after testing through this PHP code, no block is displayed in the e-mail, only content.

Where could be the problem?

Thanks!

Btw: I have purchased premium through Envato (I did not find the field to enter the product code for verification).

$mailer = WC()->mailer();
$wrapped_message = $mailer->wrap_message($heading, $message);
$wc_email = new WC_Email;
$html_message = $wc_email->style_inline($wrapped_message);
wp_mail($to, $subject, $html_message, $headers );