Symfony Mailer：在 MessageSent 事件上捕获消息时丢失上下文数据

问：

我正在尝试使用SentMessageEvent的事件侦听器捕获从Symfony 6.3应用程序发送的电子邮件。我面临的问题是，当我创建电子邮件（使用 TemplatedEmail）时，我在电子邮件上设置的上下文在触发 onMessageSent 方法时似乎是空的。

以下是我发送电子邮件的方式：

<?php

use Symfony\Bridge\Twig\Mime\TemplatedEmail;
use Symfony\Component\Mailer\MailerInterface;

readonly class EmailService
{
    public function __construct(
        private Mailer $mailer,
    ) {
    }

    public function sendEmail(): void
    {
        $email = (new TemplatedEmail())
            ->to('[email protected]')
            ->from('[email protected]')
            ->subject('My subject')
            ->htmlTemplate('email/email.html.twig')
            ->context([
                'data' => [
                    'key' => 'value'
                ]
            ]);

        $this->mailer->send($email);
    }

}

这是我的事件侦听器：

<?php

namespace App\EventListener;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Mailer\Event\MessageEvent;
use Symfony\Component\Mailer\Event\SentMessageEvent;

class MailEventListener implements EventSubscriberInterface
{
    public static function getSubscribedEvents(): array
    {
        return [
            SentMessageEvent::class => 'onMessageSent',
            MessageEvent::class => 'onMessage',
        ];
    }

    public function onMessage(MessageEvent $event): void
    {
        // Here I can access the context
        dump($event->getMessage());
        // Here is the output, the context contains the values setted when the TemplatedEmail Object
        /*
        Symfony\Bridge\Twig\Mime\TemplatedEmail {#1975
          -message: null
          -headers: Symfony\Component\Mime\Header\Headers {#1978
            -headers: array:3 [
              "to" => array:1 [
                0 => Symfony\Component\Mime\Header\MailboxListHeader {#1971
                  -name: "To"
                  -lineLength: 76
                  -lang: null
                  -charset: "utf-8"
                  -addresses: array:1 [
                    0 => Symfony\Component\Mime\Address {#1958
                      -address: "[email protected]"
                      -name: ""
                    }
                  ]
                }
              ]
              "from" => array:1 [
                0 => Symfony\Component\Mime\Header\MailboxListHeader {#1973
                  -name: "From"
                  -lineLength: 76
                  -lang: null
                  -charset: "utf-8"
                  -addresses: array:1 [
                    0 => Symfony\Component\Mime\Address {#1970
                      -address: "[email protected]"
                      -name: ""
                    }
                  ]
                }
              ]
              "subject" => array:1 [
                0 => Symfony\Component\Mime\Header\UnstructuredHeader {#1981
                  -name: "Subject"
                  -lineLength: 76
                  -lang: null
                  -charset: "utf-8"
                  -value: "My subject"
                }
              ]
            ]
            -lineLength: 76
          }
          -body: null
          -text: null
          -textCharset: null
          -html: null
          -htmlCharset: null
          -attachments: []
          -cachedBody: null
          -htmlTemplate: "email/email.html.twig"
          -textTemplate: null
          -context: array:1 [
            "data" => array:1 [
              "key" => "value"
            ]
          ]
        }
        */
    }

    public function onMessageSent(SentMessageEvent $event): void
    {
        // Here, the context seems to be empty
        dump($event->getMessage()->getOriginalMessage() );
        // Here is the output, we can see clearly that the context is empty
        // Also the context is empty if I inspect the getEnvelope(), getOriginalMessage() and getMessage() methods
        /*
        MailEventListener.php on line 27:
        Symfony\Bridge\Twig\Mime\TemplatedEmail {#2318
          -message: null
          -headers: Symfony\Component\Mime\Header\Headers {#2319
            -headers: array:3 [
              "to" => array:1 [
                0 => Symfony\Component\Mime\Header\MailboxListHeader {#2321
                  -name: "To"
                  -lineLength: 76
                  -lang: null
                  -charset: "utf-8"
                  -addresses: array:1 [
                    0 => Symfony\Component\Mime\Address {#1958
                      -address: "[email protected]"
                      -name: ""
                    }
                  ]
                }
              ]
              "from" => array:1 [
                0 => Symfony\Component\Mime\Header\MailboxListHeader {#2320
                  -name: "From"
                  -lineLength: 76
                  -lang: null
                  -charset: "utf-8"
                  -addresses: array:1 [
                    0 => Symfony\Component\Mime\Address {#1970
                      -address: "[email protected]"
                      -name: ""
                    }
                  ]
                }
              ]
              "subject" => array:1 [
                0 => Symfony\Component\Mime\Header\UnstructuredHeader {#2323
                  -name: "Subject"
                  -lineLength: 76
                  -lang: null
                  -charset: "utf-8"
                  -value: "My subject"
                }
              ]
            ]
            -lineLength: 76
          }
          -body: null
          -text: """
            


                Email content: value


            


            """
          -textCharset: "utf-8"
          -html: """
            <p>


                Email content: <b>value</b>


            </p>


            """
          -htmlCharset: "utf-8"
          -attachments: []
          -cachedBody: null
          -htmlTemplate: null
          -textTemplate: null
          -context: []
        }
        */
    }
}

有没有办法确保在捕获已发送的电子邮件时保留上下文，或者 Symfony 在发送电子邮件后有意清除上下文？