Symfony version(s) affected: 4.4.7

Description
I was able to send emails to the to() address, but bcc() seems ignored.
Using templated emails.
The URL I use for the DSN is one of type:
MAILER_DSN=ses://ACCESS_KEY:SECRET_KEY@default?region=eu-west-1

How to reproduce

$email = (new TemplatedEmail())
            ->from(new Address('emailFROM@email.com', 'nameFROM'))
            ->to(new Address('emailTO@email.com', 'nameTO'))
            ->bcc(new Address('emailBCC@email.com', 'nameBCC'))
            ->subject($subject)
            ->htmlTemplate($template)
            ->context($context);

$mailer->send($email);

• Email received at emailTO@email.com
• Email not received at emailBCC@email.com

Nothing more than that. Upon debugging, it seems that when the message is converted to raw the bcc is not present in the headers.