@ConfigurationProperties with @Validated don’t bind configuration values in integration tests

Question

I have a validated configuration properties class.

@Data
@Configuration
@ConfigurationProperties(prefix = "notifications")
@Validated
public class NotificationConfig {
    @NotNull
    @Valid
    private NotificationMessageConfig message = new NotificationMessageConfig();
    @NotNull
    @Valid
    private SmsConfig sms = new SmsConfig();
    @NotNull
    @Valid
    private EmailConfig email = new EmailConfig();
    @NotNull
    @Valid
    private NotificationTimerConfig timer = new NotificationTimerConfig();
}

In integration tests, I am trying to autowire the bean of the class. On runtime, I have an autowired bean but this bean has null values instead of bound configuration. Note! If I remove @Validated annotation, I will have a valid bean but the config will not be validated.

@Slf4j
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
@RequiredArgsConstructor
public class NotificationsIT extends BaseIntegrationTest {

    @Autowired
    private Notifications notification;
    @Autowired
    private Banks banks;
    @Autowired
    private NotificationConfig notificationConfig;

   @BeforeEach
    public void init() {
        super.init();
    // notificationConfig autowired but fields have null values
        defaultNotificationConfig = clone(notificationConfig);
    }
}