Cookies not sent to the browser

I've upgraded laravel 5.5 to laravel 5.6 and suddenly i don't have a session cookie anymore. When i checkout the branch of laravel 5.5 cookies work.

When i login on our custom login controller and i dump the result of sendLoginResponse from the default AuthenticatesUsers trait this is the response:

As you can see, nothing about cookies. So where is my cookie :)? I also did take a look at my browsers cookies, but there are no cookies (Chrome).

via Chebli Mohamed