The identifier id is missing for a query of ...

Every thing was working great, until I enabled the cache_db configuration:

liip_test_fixtures:
    cache_db:
        sqlite: liip_test_fixtures.services_database_backup.sqlite

This is the stack trace of the exception I'm getting, any help would be appreciated:

1) App\Tests\Api\EmployeeTest::testExportCollection
Doctrine\ORM\ORMException: The identifier id is missing for a query of App\Entity\Evaluation\Employee
/builds/oppbtp/oppbtp_qcm_elec_api/vendor/doctrine/orm/lib/Doctrine/ORM/ORMException.php:309
/builds/oppbtp/oppbtp_qcm_elec_api/vendor/doctrine/orm/lib/Doctrine/ORM/EntityManager.php:488
/builds/oppbtp/oppbtp_qcm_elec_api/var/cache/test/ContainerWI1DfLB/EntityManager_9a5be93.php:142
/builds/oppbtp/oppbtp_qcm_elec_api/vendor/doctrine/data-fixtures/lib/Doctrine/Common/DataFixtures/ProxyReferenceRepository.php:82
/builds/oppbtp/oppbtp_qcm_elec_api/vendor/doctrine/data-fixtures/lib/Doctrine/Common/DataFixtures/ProxyReferenceRepository.php:115
/builds/oppbtp/oppbtp_qcm_elec_api/vendor/liip/test-fixtures-bundle/src/Services/DatabaseBackup/SqliteDatabaseBackup.php:68
/builds/oppbtp/oppbtp_qcm_elec_api/vendor/liip/test-fixtures-bundle/src/Services/DatabaseTools/ORMSqliteDatabaseTool.php:52
/builds/oppbtp/oppbtp_qcm_elec_api/vendor/liip/test-fixtures-bundle/src/Test/FixturesTrait.php:86
/builds/oppbtp/oppbtp_qcm_elec_api/src/Test/CustomApiTestCase.php:51

This a small vision about my dependencies:

doctrine/data-fixtures                       1.4.2   Data Fixtures for al...
doctrine/doctrine-fixtures-bundle            3.3.0   Symfony DoctrineFixt...
liip/test-fixtures-bundle                    1.7.0   This bundles enables.

Reproduce App\Tests\Api\EmployeeTest::testExportCollection with the shown cache_db SQLite configuration. Start with the stack-trace path through vendor/liip/test-fixtures-bundle/src/Services/DatabaseBackup/SqliteDatabaseBackup.php and the Doctrine fixture calls; done means the test no longer raises the missing Employee identifier exception when database caching is enabled.