### 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_
erialization
        serialized_response = self._create_default_roperation_model, mime_type)
        if not error or not isinstance(error, ServiceException):
            raise ProtocolSerializerError(
                f"Error to serialize ({error.__class__.__name__ if error else None}) is not a ServiceException."
            )
        shape = operation_model.service_model.shape_for_error_code(error.code)
        serialized_response.status_code = error.status_code
        self._serialize_error(error, serialized_response, shape, operation_model, mime_type)
        serialized_response = self._prepare_additional_traits_in_r
            serialized_response, operation_model
        )
        return serialized_response
    def _serialize_r
        self,
        parameters: dict,
        response: HttpResponse,
        shape: Optional[Shape],
        shape_members: dict,
        operation_model: OperationModel,
        mime_type: str,
    ) -> None:
        raise NotImplementedError
    def _serialize_body_params(
        self,
        params: dict,
        shape: Shape,
        operation_model: OperationModel,
        mime_type: str,
    ) -> Optional[str]:
        """
        Actually serializes the given params for the given shape to a string for the transmission in the body of the
        response.
        :param params: to serialize
        :param shape: to know how to serialize the params
        :param operation_model: for additional metadata
        :param mime_type: Mime type which should be used to encode the payload
        :return: string containing the serialized body
        """
        raise NotImplementedError
    def _serialize_error(
        self,
        error: ServiceException,
        response: HttpResponse,
        shape: StructureShape,
        operation_model: OperationModel,
        mime_type: str,
    ) -> None:
        raise NotImplementedError
    def _serialize_event_stream(
        self, response: dict, operation_model: OperationModel, mime_type