route_enhancer.authentication non existent service when beta 7 to beta 9

Hi,

i've upgraded from beta 7 to beta 9 and i've got this error

existent service "route_enhancer.authentication"." at /Users/xadag/Developpement/www/yogarik/mahousecostaud/core/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/Container.php line 317

I saw that the route route_enhancer.authentication disapear from core.services.yml but don't know how to fix that because a lot of reference to this route is in the router table.

Any idea ?

Thanks!