Newsletter Actions Not Fired with MailerSend Addon

My plugin does not receive the following actions when using the MailerSend addon:
newsletter_user_bounced
newsletter_user_complained
newsletter_user_unsubscribed

When the MailerSend addon processes email status notifications in webhook_callback() it calls set_user_status() for bounce, complaint, and unsubscribed notifications, but does not invoke the corresponding newsletter_user actions.

It seems to me, the webhook_callback() should be calling the following instead of set_user_status() where the actions are fired.
$this->set_bounced()
$this->set_complained()
$this->set_unsubscribed()