question: why some of injected services are undefined?

The problem: I have 3 services:

ApiHelper

@Service()
export class ApiHelper {
	// contains only methods, none of services are injected
}

LoginService

@Service()
export class SecurityService {
    @Inject()
    private loginService: LoginService;
}

And SecurityService

@Service()
export class LoginService {
    constructor(
        private apiHelper: ApiHelper,
        private securityService: SecurityService,
    ) {
        console.log(this.securityService); // undefined
        console.log(Container.get(SecurityService)); // instance of SecurityService
    }
}

And the problem is that securityService is undefined, while Container.get(SecurityService) works good.

What is wrong here?