Twitter Embed iframe doesn’t add sizes as recommeended by Facebook

I have been rejected when submitting for approval 2 times because of “Embed” related issues. When carefully checked, it was related to a Twitter embed. I have tried pasting the Twitter embed code from the site to the dashboard text editor. And, I have tried to paste just an Tweet URL to the Visual editor of the WordPress dashboard.
In the Instant Article source code, iframe tag is not showing any kind of sizes in it, but Facebook highly recommend to add size to the iframe tag.
Page manager app previews fine. But, Review team rejected.
I guess, the plugin should automatically add the size to the iframe tag or any update required to solve this issue.
Here, I have posted about this problem in details.