### 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_
cleanup_fns = []
    yield cleanup_fns
    for cleanup_callback in cleanup_fns[::-1]:
        try:
            cleanup_callback()
        except Exception as e:
            LOG.warning("Failed to execute cleanup", exc_info=e)
@pytest.fixture(scope="session")
def account_id(aws_client):
    sts_client = aws_client.sts
    return sts_client.get_caller_identity()["Account"]
@pytest.hookimpl
def pytest_configure(config: Config):
    
    config.addinivalue_line(
        "markers",
        "only_localstack: mark the test as incompatible with AWS / can't be run with AWS_CLOUD target",
    )
@pytest.hookimpl
def pytest_collection_modifyitems(config: Config, items: list[Item]):
    only_localstack = pytest.mark.skipif(
        os.environ.get("TEST_TARGET") == "AWS_CLOUD",
        reason="test only applicable if run against localstack",
    )
    for item in items:
        if "only_localstack" in item.keywords:
            item.add_marker(only_localstack)
@pytest.fixture
def sample_stores() -> AccountRegionBundle:
    class SampleStore(BaseStore):