### 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_
roles = {}
    def _create_role_and_policy(**kwargs):
        role = kwargs["RoleName"]
        policy = kwargs["PolicyName"]
        role_policy = json.dumps(kwargs["RoleDefinition"])
        result = iam_client.create_role(RoleName=role, AssumeRolePolicyDocument=role_policy)
        role_arn = result["Role"]["Arn"]
        policy_document = json.dumps(kwargs["PolicyDefinition"])
        iam_client.put_role_policy(RoleName=role, PolicyName=policy, PolicyDocument=policy_document)
        roles[role] = policy
        return role_arn
    yield _create_role_and_policy
    for role_name, policy_name in roles.items():
        iam_client.delete_role_policy(RoleName=role_name, PolicyName=policy_name)
        iam_client.delete_role(RoleName=role_name)
@pytest.fixture
def firehose_create_delivery_stream(firehose_client, wait_for_delivery_stream_ready):
    delivery_streams = {}
    def _create_delivery_stream(**kwargs):
        if "DeliveryStreamName" not in kwargs:
            kwargs["DeliveryStreamName"] = f"test-delivery-stream-{short_uid()}"
        delivery_stream = firehose_client.create_delivery_stream(**kwargs)
        delivery_streams.update({kwargs["DeliveryStreamName"]: delivery_stream})
        wait_for_delivery_stream_ready(kwargs["DeliveryStreamName"])
        return delivery_stream
    yield _create_delivery_stream
    for delivery_stream_name in delivery_streams.keys():
        firehose_client.delete_delivery_stream(DeliveryStreamName=delivery_stream_name)
@pytest.fixture
def events_create_rule(events_client):