### 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_
region_name = kwargs.pop("region_name", None)
        apigateway_client = aws_client_factory(region_name=region_name).apigateway
        response = apigateway_client.import_rest_api(**kwargs)
        api_id = response.get("id")
        rest_apis.append((api_id, region_name))
        return api_id, response
    yield _create_apigateway_function
    for rest_api_id, region_name in rest_apis:
        with contextlib.suppress(Exception):
            apigateway_client = aws_client_factory(region_name=region_name).apigateway
            apigateway_client.delete_rest_api(restApiId=rest_api_id)
@pytest.fixture
def appsync_create_api(appsync_client):
    graphql_apis = []
    def factory(**kwargs):
        if "name" not in kwargs:
            kwargs["name"] = f"graphql-api-testing-name-{short_uid()}"
        if not kwargs.get("authenticationType"):
            kwargs["authenticationType"] = "API_KEY"
        result = appsync_client.create_graphql_api(**kwargs)["graphqlApi"]
        graphql_apis.append(result["apiId"])
        return result
    yield factory
    for api in graphql_apis:
        try:
            appsync_client.delete_graphql_api(apiId=api)
        except Exception as e:
            LOG.debug(f"Error cleaning up AppSync API: {api}, {e}")
@pytest.fixture
def assert_host_customisation(monkeypatch):