Going to /user/logout on my cas site produces this exception:
Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException: You have requested a non-existent service "url_generator.non_bubbling". in Drupal\Component\DependencyInjection\Container->get() (line 157 of /var/www/html/web/core/lib/Drupal/Component/DependencyInjection/Container.php).
I think this is because the controller is using the url_generator.non_bubbling service as an argument and it's marked as a private service by core.
I realise that cache metadata bubbling was causing problems with CAS in some cases #2599416: Redirect to CAS login failing on D8 RC2 → , so I'm hesitant to suggest the use of "url_generator" but I'm not sure of a more appropriate fix here.
This is with Drupal core 8.3.7
Needs review
2.0
CAS
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I encounter this error after updating to drupal:9.5.11 and cas:2.2.0 ...
unsure how to reproduce it but after replacing url_generator.non_bubbling to url_generator in cas.service.yml and src/Controller/LogoutController.php (line 75), it was fixed.