On a master (not happening on 1.11.0), when creating a bundle, I am confronted with the following error:

> Checking that the bundle is autoloaded
FAILED
> Enabling the bundle inside app/AppKernel.php
  updated ./app/AppKernel.php
OK
> Importing the bundle's routes from the app/config/routing.yml file
  updated ./app/config/routing.yml
OK
> Importing the bundle's services.yml from the app/config/config.yml file
  updated ./app/config/config.yml
OK

but the bundle is correctly registered on AppKernel.php, routing.yml and config.yml.
There seems to be a problem with autoload configuration since afterwards, when I try to run any command such as:

php app/console cache:clear

I always get:

PHP Fatal error:  Class 'EzSystems\MyBundle\EzSystemsMyBundle' not found in /var/www/html/ezpmaster/app/AppKernel.php on line 55

but the path matches correctly.
I solved the problem manually by editing my composer.json and altering:

"autoload": {
        "psr-4": {
            "AppBundle\\": "src/AppBundle/"
        },
        "classmap": [ "app/AppKernel.php", "app/AppCache.php" ]
    },

to:

"autoload": {
        "psr-4": {
            "": "src/"
        },
        "classmap": [ "app/AppKernel.php", "app/AppCache.php" ]
    },

and running:

composer dumpautoload

After this it all works correctly.
It seems to be quite recent since, as previously stated, this does not happen on a 11.1.0.