### 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_
ec2_sgs = []
    def factory(ports=None, **kwargs):
        if "GroupName" not in kwargs:
            kwargs["GroupName"] = f"test-sg-{short_uid()}"
        security_group = ec2_client.create_security_group(**kwargs)
        permissions = [
            {
                "FromPort": port,
                "IpProtocol": "tcp",
                "IpRanges": [{"CidrIp": "0.0.0.0/0"}],
                "ToPort": port,
            }
            for port in ports or []
        ]
        ec2_client.authorize_security_group_ingress(
            GroupName=kwargs["GroupName"],
            IpPermissions=permissions,
        )
        ec2_sgs.append(security_group["GroupId"])
        return security_group
    yield factory
    for sg_group_id in ec2_sgs:
        try:
            ec2_client.delete_security_group(GroupId=sg_group_id)
        except Exception as e:
            LOG.debug("Error cleaning up EC2 security group: %s, %s", sg_group_id, e)
@pytest.fixture
def cleanups(ec2_client):