### 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_
 the message if it has not been set with the shape members
        if "message" not in body and "Message" not in body:
            message = self._get_error_message(error)
            if message is not None:
                body["message"] = message
        if mime_type in self.CBOR_TYPES:
            response.set_rcbor2.dumps(body))
            response.content_type = mime_type
        else:
            response.set_json(body)
    def _serialize_r
        self,
        parameters: dict,
        response: HttpResponse,
        shape: Optional[Shape],
        shape_members: dict,
        operation_model: OperationModel,
        mime_type: str,
    ) -> None:
        if mime_type in self.CBOR_TYPES:
            response.content_type = mime_type
        else:
            json_version = operation_model.metadata.get("jsonVersion")
            if json_version is not None:
                response.headers["Content-Type"] = "application/x-amz-json-%s" % json_version
        response.set_r
            peration_model, mime_type)
        )
    def _serialize_body_params(
        self, params: dict, shape: Shape, operation_model: OperationModel, mime_type: str
    ) -> Optional[str]:
        body = {}
        if shape is not None:
            self._serialize(body, params, shape, None, mime_type)
        if mime_type in self.CBOR_TYPES:
            return cbor2.dumps(body)
        else:
            return json.dumps(body)
    def _serialize(self, body: dict, value: Any, shape, key: Optional[str], mime_type: str):
        """This method dynamically invokes the correct `_serialize_type_*` method for each shape type."""
        try:
            method = getattr(self, "_serialize_type_%s" % shape.type_name, self._default_serialize)
            method(body, value, shape, key, mime_type)
        except (TypeError, ValueError, AttributeError) as e:
            raise ProtocolSerializerError(
                f"Invalid type when serializing {shape.name}: '{value}' cannot be parsed to {sha