Show all recipients in "To:" Field

Perhaps this is covered in another issue, but I couldn't find it.

I recently updated a clients version of Webform to 6x-3.11 and noticed that the "To:" field that the email recipient gets only shows their own email address, whereas previously it would show all the recipients (if they were all entered into one email To field).

For example, if you had bob@example.com,john@example.com,sue@example.com all in the To field, the email message would show all three addresses. Now it appears that Webform is parsing them out individually, so that each recipient is only seeing their own name and no others. I've tried using 6x-3.11 with multiple email addresses in one field, as well as doing individual email addresses but they all only show the single recipient, not all.

This presents a bit of a problem for the client, as they use this to reply to all, as well as to know that everyone received the email. I noticed that up until version 6x-3.9, this display still appears to be in there, but now it is gone. Is there any way to get this back or was it changed for a particular reason (security perhaps)? The form submits perfectly fine and the emails are going to everyone correctly, but the change in the form has frustrated the client.

Any help would be appreciated. Thanks!