Symfony version(s) affected: 5.2

Description
I have symfony/mailer and symfony/mailjet-mailer installed.

My composer.json contains this.

{
#...
        "symfony/mailer": "5.2.*",
        "symfony/mailjet-mailer": "^5.2@dev",
#...
}

My .env contains:

MAILER_DSN=mailjet+smtp://xxx:yyy@default

I get the following error:

The "mailjet+smtp" scheme is not supported.

I also get a similar error with mailjet+api