Why is the Twitter code "embedding Twitter content" being transformed?

[belpartisan]

Why is the Twitter code “embedding Twitter content” being transformed upon editing and saving in the HTML-form of the news items adding and then disappeared?
(Site contains script async src="//platform.twitter.com/widgets.js)

From <blockquote class="twitter-tweet" data-lang="ru">.....
To <twitterwidget class="twitter-tweet twitter-tweet-rendered" id="twitter-widget-0" style="position: static; visibility: visible; display: block; transform: rotate(0deg); max-width: 100%; width: 500px; min-width: 220px; margin-top: 10px; margin-bottom: 10px;" data-tweet-id="927506954733412352"></twitterwidget>

[indianburger]

blockquote is the fallback markup which gets enhanced into a full media rich widget by using Javascript, hence the transformation.

If you can give me some more context on why you are asking then I can provide more details here. Are you running into any issues?

[system]

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