mail attachment not included

@nojj Are you sure it is fixed by the Symfony Mailer dev version?
Until I have switched from SwiftMailer to Symfony mailer, I can not get Commerce Invoice attaching invoices to emails.
I am working on Drupal 9.5 (on PHP 8.1) with Commerce invoice 2.0-rc3 and Symfony Mailer 1.x-dev.
As it worked on drupal test website, I have uninstalled Mail System and SwiftMailer (emails are fine globally).

Drupal log sent this message (Type : commerce_invoice) :

RuntimeException: Failed to start the session because headers have already been sent by "/home/my-website/public_html/vendor/symfony/http-foundation/Response.php" at line 1239. in Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start() (line 152 of /home/my-website/public_html/vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php).

Thanks for any tip here.

Subscribed. Have the same issue as #9 🐛 mail attachment not included Active