### 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_
url: str,
        *,
        use_hostname_external: bool = False,
        use_localstack_hostname: bool = False,
        use_localstack_cloud: bool = False,
        use_localhost: bool = False,
        custom_host: Optional[str] = None,
    ):
        if use_hostname_external:
            assert hostname_external in url
            assert localstack_hostname not in url
            assert constants.LOCALHOST_HOSTNAME not in url
            assert constants.LOCALHOST not in url
        elif use_localstack_hostname:
            assert localstack_hostname in url
            assert hostname_external not in url
            assert constants.LOCALHOST_HOSTNAME not in url
            assert constants.LOCALHOST not in url
        elif use_localstack_cloud:
            assert constants.LOCALHOST_HOSTNAME in url
            assert hostname_external not in url
            assert localstack_hostname not in url
        elif use_localhost:
            assert constants.LOCALHOST in url
            assert constants.LOCALHOST_HOSTNAME not in url
            assert hostname_external not in url
            assert localstack_hostname not in url
        elif custom_host is not None:
            assert custom_host in url