Docker Compose – Wiremock not able to answer REST call from SpringBootApplication

I have a Spring Application that is making REST calls that is intercepted by Wiremock, running this setup on my local machine works well but when running dockerized I can see that the request reaches Wiremock but nothing comes back so from the application side it looks like the connection was refused. Where did the response go?

Stripped version of my docker-compose file:

version: "3.9"
services:
    test-service-application:
        build:
            context: .
            dockerfile: Dockerfile-local
        hostname: test-service
        privileged: true
        ports:
            - "22101:22101" # Application port
        environment:
            - "SPRING_PROFILES_ACTIVE=local"

    wiremock:
        image: 'wiremock/wiremock:2.32.0'
        container_name: 'wiremock'
        ports:
            - "8443:8080" # Web browser
            - "30121:8080" # Service #1
        environment:
            https-port: 8443
            http-port: 8443

And REST call:

WebClient webClient = WebClient.builder()
    .clientConnector(new ReactorClientHttpConnector(HttpClient.create()))
    .build();

webClient
    .method(HttpMethod.GET)
    .uri("http://localhost:30121/test-endpoint/")
    .contentType(MediaType.APPLICATION_JSON)
    .retrieve()
    .bodyToMono(MyClassDTO)
    .block();