Showing email addresses for who else email is sent to

When sending an invoice and I have selected more than one contact from the client, the email that each contact receives shows who else the email has been sent to (at the bottom of the email). This is useful as typically I want the invoice to go to more than one email address, and I would like eack recipient to know who else has received it.
However, when I try to do the same thing with an invoice raised from a recurring invoice, I find that it does not show who else has received the email in the same way. (Also, and of much less consequence), the link to the invoice shows just as a link and not as a button).
Is this a bug?
Could this be rectified please?