Hi, since S3 is an AWS service the behaviour is determined by the service itself. From documentation:

AWS services — AWS services can invoke your function synchronously or asynchronously. For synchronous invocation, the service decides whether to retry. For example, Amazon S3 batch operations retries the operation if the Lambda function returns a TemporaryFailure response code. Services that proxy requests from an upstream user or client may have a retry strategy or may relay the error response back to the requestor. For example, API Gateway always relays the error response back to the requestor.