### 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_
service, region_name=None, aws_access_key_id=None, *, additional_config=None
    ):
        return aws_client_factory.get_client(
            service_name=service, region_name=region_name, config=additional_config
        )
    return _factory_client
@pytest.fixture(scope="class")
def boto3_session():
    if os.environ.get("TEST_TARGET", "") == "AWS_CLOUD":
        return boto3.Session()
    return boto3.Session(
        
        aws_access_key_id=get_aws_account_id(),
        aws_secret_access_key="__test_key__",
    )
@pytest.fixture(scope="class")
def aws_http_client_factory(boto3_session):
    """
    Returns a factory for creating new ``SigningHttpClient`` instances using a configurable botocore request signer.
    The default signer is a SigV4QueryAuth. The credentials are extracted from the ``boto3_sessions`` fixture that
    transparently uses your global profile when TEST_TARGET=AWS_CLOUD, or test credentials when running against
    LocalStack.
    Example invocations
        client = aws_signing_http_client_factory("sqs")
        client.get("http://localhost:4566/000000000000/my-queue")
    or
        client = aws_signing_http_client_factory("dynamodb", signer_factory=SigV4Auth)
        client.post("...")
    """
    def factory(