### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

Sending a message with body:
`"&quot;&quot;"`
is received on the consumer side with body:
`""""`

### Expected Behavior

Sending a message with body:
"&quot;&quot;"
is received on the consumer side with body:
"&quot;&quot;"

### How are you starting LocalStack?

Custom (please describe below)

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

Running localstack in docker desktop on Mac using helm chart

https://localstack.github.io/helm-charts
version 0.3.7
Image version: 0.14.3

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)



### Environment

```markdown
- OS: macOS Monterey
- LocalStack: 0.14.3
```


### Anything else?

_No response_
oad(body_payload)
            response.set_rbody_payload)
        elif payload_member is not None:
            # If there's a payload member, we serialized that member to the body.
            body_params = parameters.get(payload_member)
            if body_params is not None:
                response.set_r
                    _payload(
                        self._serialize_body_params(
                            body_params, shape_members[payload_member], operation_model, mime_type
                        )
                    )
                )
        else:
            # Otherwise, we use the "traditional" way of serializing the whole parameters dict recursively.
            response.set_r
                _payload(
                    peration_model, mime_type)
                )
            )
    def _serialize_content_type(
        self, serialized: HttpResponse, shape: Shape, shape_members: dict, mime_type: str
    ):
        """
        Some protocols require varied Content-Type headers depending on user input.
        This allows subclasses to apply this conditionally.
        """
        pass
    def _has_streaming_payload(self, payload: Optional[str], shape_members):
        """Determine if payload is streaming (a blob or string)."""
        return payload is not None and shape_members[payload].type_name in ["blob", "string"]
    def _prepare_additional_traits_in_r
        self, response: HttpResponse, operation_model: OperationModel
    ):
        """Adds the request ID to the headers (in contrast to the body - as in the Query protocol)."""
        response = super()._prepare_additional_traits_in_rresponse, operation_model)
        response.headers["x-amz-request-id"] = gen_amzn_requestid_long()
        return response
    def _process_header_members(self, parameters: dict, response: HttpResponse, shape: Shape):
        shape_members = shape.members if isinstance(shape, StructureShape) else []
        for name in shape_members:
            member_shape