May be a duplicate of https://github.com/localstack/localstack/issues/988 but due to the age I will re raise.

I'm having issues when I throw an exception in a lambda - it isn't appearing on my dead letter queue. Is there something I am missing, I would like an sqs event exception to appear on the poison queue when an exception happens.

Below is the basic config:
 ````
    sqsclient.create_queue(QueueName = 'test-queue')
    sqsclient.create_queue(QueueName = 'test-queue-poison')

    lambda_client.create_function(
            FunctionName='MyFunction',
            Runtime='dotnetcore2.1',
            Role='role',
            Handler='Handler',
            Code=code,
	    DeadLetterConfig={'TargetArn': 'test-queue-poison-arn'})

     lambda_client.create_event_source_mapping(
		EventSourceArn='test-queue-arn',
		FunctionName='MyFunction',
		Enabled=True,
		BatchSize=100,
		StartingPosition='LATEST')
````

So when I raise a new (.net)exception within the lambda function no message is going to the dead letter queue. I can confirm that all is attached together OK as all other scenarios work, and the above code is pseudo-ish.
base_dir = file_path
    if not os.path.isdir(file_path):
        base_dir = tempfile.mkdtemp(prefix=ARCHIVE_DIR_PREFIX)
        shutil.copy(file_path, base_dir)
        TMP_FILES.append(base_dir)
    tmp_dir = tempfile.mkdtemp(prefix=ARCHIVE_DIR_PREFIX)
    zip_file_name = 'archive.zip'
    full_zip_file = os.path.join(tmp_dir, zip_file_name)
    
    if is_alpine():
        create_zip_file_cli(file_path, base_dir, zip_file=full_zip_file)
    else:
        create_zip_file_python(file_path, base_dir, zip_file=full_zip_file)
    if not get_content:
        TMP_FILES.append(tmp_dir)
        return full_zip_file
    zip_file_content = None
    with open(full_zip_file, 'rb') as file_obj:
        zip_file_content = file_obj.read()
    rm_dir(tmp_dir)
    return zip_file_content
def create_lambda_function(func_name, zip_file, event_source_arn=None, handler=LAMBDA_DEFAULT_HANDLER,
        starting_position=None, runtime=None, envvars={}, tags={}, delete=False, layers=None):
    """Utility method to create a new function via the Lambda API"""
    starting_position = starting_position or LAMBDA_DEFAULT_STARTING_POSITION
    runtime = runtime or LAMBDA_DEFAULT_RUNTIME
    client = aws_stack.connect_to_service('lambda')