### 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_
return kms_create_key()
@pytest.fixture
def kms_grant_and_key(kms_client, kms_key, sts_client):
    user_arn = sts_client.get_caller_identity()["Arn"]
    return [
        kms_client.create_grant(
            KeyId=kms_key["KeyId"],
            GranteePrincipal=user_arn,
            Operations=["Decrypt", "Encrypt"],
        ),
        kms_key,
    ]
@pytest.fixture
def opensearch_wait_for_cluster(opensearch_client):