This is the replacement code I literally just used on a post on a private site without issue-
Code:
<blockquote class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr"><a href="https://twitter.com/twt/status/{param}">Embedded Tweet</a></blockquote>
<script src="//platform.twitter.com/widgets.js" charset="utf-8"></script>
Virtually identical, but does that help at all?