Can send mail from Contacts app to Group but not as BCC

[BiglifeMatt]

Steps to reproduce

1. Go to Contacts and create a Contact Group
2. Select Send Email from the three dot menu next to the group name and it opens the email with the users just fine.
3. Select Send Email as BCC from the three dot menu next to the group name and it returns an Internal Server Error page.

Expected behavior

The process should open the Mail app Compose Email window with the group members listed in the BCC field as it does in the To field when the Send Email option is used.

Actual behavior

Internal Server Error page

Mail app version

3.6.0

Mailserver or service

dovecot

Operating system

Ubuntu 22.04

PHP engine version

PHP 8.1

Web server

Apache (supported)

Database

MariaDB

Additional info

No response

[BiglifeMatt]

Actually this may be because I only had one user in the group I was sending. I added one more person for testing and do not get the error. However, in either case I notice it is only adding the first person in the group's email address. No one else is added.