### 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_
erred mime type (based on the serializer's supported mime types and the Accept header)
        mime_type = self._get_mime_type(headers)
        # if the operation has a streaming output, handle the serialization differently
        if operation_model.has_event_stream_output:
            return self._serialize_event_stream(response, operation_model, mime_type)
        serialized_response = self._create_default_roperation_model, mime_type)
        shape = operation_model.output_shape
        # The shape can also be none (for empty responses), but it still needs to be serialized (to add some metadata)
        shape_members = shape.members if shape is not None else None
        self._serialize_r
            response, serialized_response, shape, shape_members, operation_model, mime_type
        )
        serialized_response = self._prepare_additional_traits_in_r
            serialized_response, operation_model
        )
        return serialized_response
    @_handle_exceptions
    def serialize_error_to_r
        self,
        error: ServiceException,
        operation_model: OperationModel,
        headers: Optional[Dict | Headers],
    ) -> HttpResponse:
        """
        Takes an error instance and serializes it to an actual HttpResponse.
        Therefore, this method is used for errors which should be serialized and transmitted to the calling client.
        :param error: to serialize
        :param 
                                service's output / response
        :param headers: the headers of the incoming requ
                        for features like Content-Negotiation 
        :return: HttpResponse which can be sent to the calling client
        :raises: ResponseSerializerError (either a ProtocolSerializerError or an UnknownSerializerError)
        """
        # determine the preferred mime type (based on the serializer's supported mime types and the Accept header)
        mime_type = self._get_mime_type(headers)
        # TODO implement streaming error s