Symfony Dependency Injection: Maximum function nesting level

I have project based on Symfony 4. I wanted to start writing functional tests based on WebTestCase. I enabled framework.test: true in configuration and provided APP_ENV=test in phpunit.

There is issue with services container being built for test env. I literally didn't change anything expect APP_ENV and framework.test.

When I fetch service from test cached container I end up with:

Maximum function nesting level of '256' reached, aborting!

In stack trace I can see that symfony's DI keeps trying to fetch the same service:

 ...
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getPanel_Model_EventService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:483
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getDefaultEventRepositoryService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:525
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getDbReachingEventTranslationProviderService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:509
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getCachingEventTranslationProviderService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:541
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getEventContextTakingTranslatorService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:402
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getModelConfiguratorService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:1089
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getPanel_Model_EventService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:483
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getDefaultEventRepositoryService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:525
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getDbReachingEventTranslationProviderService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:509
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getCachingEventTranslationProviderService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:541
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getEventContextTakingTranslatorService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:402
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getModelConfiguratorService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:1089
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getPanel_Model_EventService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:483
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getDefaultEventRepositoryService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:525
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getDbReachingEventTranslationProviderService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:509
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getCachingEventTranslationProviderService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:541
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getEventContextTakingTranslatorService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:402
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getModelConfiguratorService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:1089
 ContainerE6ODQnH\srcApp_KernelTestDebugContainer->getPanel_Model_EventService() at /var/www/html/panel/var/cache/test/ContainerE6ODQnH/srcApp_KernelTestDebugContainer.php:483
...

It's weird because I don't have circular reference in my definitions. In APP_ENV=dev everything is OK.

It looks like for some reason test container cannot remember references to existing services in $this->services property.

Do you know what are building differences of dev and test containers?

When I compare test container php file with dev version. They are indeed different. No reason why...