### 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_
 attr = (
            {"xmlns": operation_model.metadata.get("xmlNamespace")}
            if "xmlNamespace" in operation_model.metadata
            else {}
        )
        root = ETree.Element("ErrorResponse", attr)
        error_tag = ETree.SubElement(root, "Error")
        self._add_error_tags(error, error_tag, mime_type)
        request_id = ETree.SubElement(root, "RequestId")
        request_id.text = gen_amzn_requestid_long()
        self._add_additional_error_tags(error, root, shape, mime_type)
        response.set_r_payload(o_string(pe)))
    def _add_error_tags(
        self, error: ServiceException, error_tag: ETree.Element, mime_type: str
    ) -> None:
        code_tag = ETree.SubElement(error_tag, "Code")
        code_tag.text = error.code
        message = self._get_error_message(error)
        if message:
            self._default_sersage", mime_type)
        if error.sender_fault:
            # The sender fault is either not set or "Sender"
            self._default_serialize(error_tag, "Sender", None, "Type", mime_type)
    def _add_additional_error_tags(
        self, error: ServiceException, node: ETree, shape: StructureShape, mime_type: str
    ):
        if shape:
            params = {}
            # TODO add a possibility to serialize simple non-modelled errors (like S3 NoSuchBucket#BucketName)
            for member in shape.members:
                # XML protocols do not add modeled default fields to the root node
                # (tested for cloudfront, route53, cloudwatch, iam)
                if member.lower() not in ["code", "message"] and hasattr(error, member):
                    params[member] = getattr(error, member)
            # If there is an error shape with members which should be set, they need to be added to the node
            if params:
                # Serialize the remaining params
                pe.name)
                pseudo_root = ETree.Element("")
                self._serialize(shape, params, pseudo_root, root_