### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When starting the transcription job in response job object is null:

<img width="1154" alt="Screenshot 2023-04-03 at 09 21 09" src="https://user-images.githubusercontent.com/454412/229447066-1671f811-da49-478d-bf24-252f30b17699.png">


### Expected Behavior

Response from the real AWS stack - job object is not null

<img width="1161" alt="Screenshot 2023-04-03 at 09 30 13" src="https://user-images.githubusercontent.com/454412/229441498-06125248-3b68-4679-8204-0163e8245db6.png">


### How are you starting LocalStack?

Custom (please describe below)

### Steps To Reproduce

Using test containers, reproducing project can be found here:

https://github.com/kkocel/local-stack-transcribe-repro

### Environment

```markdown
- OS: macOS
- LocalStack: latest
```


### Anything else?

_No response_
assert constants.LOCALHOST_HOSTNAME not in url
            assert hostname_external not in url
            assert localstack_hostname not in url
        else:
            raise ValueError("no assertions made")
    yield asserter
@pytest.fixture
def echo_http_server(httpserver: HTTPServer):
    """Spins up a local HTTP echo server and returns the endpoint URL"""
    def _echo(request: Request) -> Response:
        result = {
            "data": request.data or "{}",
            "headers": dict(request.headers),
            "url": request.url,
            "method": request.method,
        }
        response_body = json.dumps(json_safe(result))
        return Response(response_body, status=200)
    httpserver.expect_request("").respond_with_handler(_echo)
    http_endpoint = httpserver.url_for("/")
    return http_endpoint
@pytest.fixture
def echo_http_server_post(echo_http_server):
    """
    Returns an HTTP echo server URL for POST requests that work both locally and for parity tests (against real AWS)
    """
    if is_aws_cloud():
        return f"{PUBLIC_HTTP_ECHO_SERVER_URL}/post"
    return f"{echo_http_server}/post"
def create_policy_doc(effect: str, actions: List, resource=None) -> Dict: