I have 2 files.
services.yaml
imports:
    - { resource: services/service_test.yaml }
services:
    _defaults:
        autowire: true
        autoconfigure: true
and service_test.yaml
services:
    _defaults:
      autowire: true
      autoconfigure: true
    App\Test\TestAbstract:
      abstract: true
    App\Test\TestA:
      parent: App\Test\TestAbstract
      autowire: false
      autoconfigure: false
      tags:
        - { name: app.test }
    App\Test\TestManager:
      arguments: [!tagged { tag: 'app.test' }]
my class TestManager has a constructor
public function __construct(iterable $tests, LoggerInterface $logger)
{
    dump($tests);
    $this->logger = $logger;
}
With that configuration I have the error:
Cannot autowire service "App\Test\TestManager": argument "$tests" of method "__construct()" is type-hinted "iterable", you should configure its value explicitly.
How can I get my tagged services with !tag ?
 
     
    