没有调用Symfony本地捆绑

I am creating an external bundle but during development I wish to test it along side a full project.

Inside my composer.json I have:

"repositories": [
    {
        "type": "path",
        "url": "../path-to-my-project"
    }
],

and in the require section "acme/my-package": "*"

I'm also adding the FQNS to the autoload config:

"autoload": {
    "psr-4": {
        "App\\": "src/",
        "Acme\\Bundle\\MyBundle\\": "vendor/acme/my-package"
    }
}

Inside the bundles.php I have Acme\Bundle\MyBundle\MyBundleBundle::class => ['all' => true], but this file isn't triggered, I have tried using bin/console cache:clear with a var_dump and exit and it never gets called. What am I missing?