### 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_
]
        for attached_policy in attached_policies:
            try:
                iam_client.detach_user_policy(
                    UserName=username, PolicyArn=attached_policy["PolicyArn"]
                )
            except Exception:
                LOG.debug(
                    "Error detaching policy '%s' from user '%s'",
                    attached_policy["PolicyArn"],
                    username,
                )
        access_keys = iam_client.list_access_keys(UserName=username)["AccessKeyMetadata"]
        for access_key in access_keys:
            try:
                iam_client.delete_access_key(
                    UserName=username, AccessKeyId=access_key["AccessKeyId"]
                )
            except Exception:
                LOG.debug(
                    "Error deleting access key '%s' from user '%s'",
                    access_key["AccessKeyId"],
                    username,
                )
        try:
            iam_client.delete_user(UserName=username)
        except Exception as e:
            LOG.debug("Error deleting user '%s' during test cleanup: %s", username, e)
@pytest.fixture
def wait_and_assume_role(sts_client):