**Symfony version(s) affected**: 5.2.4 **Description** Undefined index: _service_doctrine.orm.default_listeners.attach_entity_listeners **How to reproduce** Downgrading to 5.2.3. the error disappears **Additional context** ``` [2021-03-04T20:30:49.646533+01:00] request.CRITICAL: Exception thrown when handling an exception (ErrorException: Notice: Undefined index: _service_doctrine.orm.default_listeners.attach_entity_listeners at /app/vendor/symfony/doctrine-bridge/ContainerAwareEventManager.php line 64) {"exception":"[object] (ErrorException(code: 0): Notice: Undefined index: _service_doctrine.orm.default_listeners.attach_entity_listeners at /app/vendor/symfony/doctrine-bridge/ContainerAwareEventManager.php:64)"} [] ```