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.
def __init__(self, id):
        super(SqsQueue, self).__init__(id)
    def name(self):
        return self.id.split(':')[-1]
class S3Bucket(Component):
    def __init__(self, id):
        super(S3Bucket, self).__init__(id)
        self.notifications = []
    def name(self):
        return self.id.split('arn:aws:s3:::')[-1]
class S3Notification(Component):
    def __init__(self, id):
        super(S3Notification, self).__init__(id)
        self.target = None
        self.trigger = None
class EventSource(Component):
    def __init__(self, id):
        super(EventSource, self).__init__(id)
    @staticmethod
    def get(obj, pool=None, type=None):
        pool = pool or {}
        if not obj:
            return None
        if isinstance(obj, Component):
            obj = obj.id
        if obj in pool: