Caveat emptor - List does not have read-after-write consistency. See <a href="https://forums.aws.amazon.com/thread.jspa?messageID=687028#687028" rel="nofollow">https://forums.aws.amazon.com/thread.jspa?messageID=687028#6...</a><p>I've seen this issue numerous times in production. I've been quietly waiting for AWS to fix it :)