It looks like the Twitter problem hasn't been fixed after all these years. I am surprised that noone is mentioning it. When we put an embed Twitter code in an article, and this code has at least one icon, then this one icon is enough for the whole article to collapse. Look at the unlisted video below:
https://youtu.be/s4RENXfqels
So when I edit the Twitter post and remove those icons, then the article appears normally.
I want a hotfix for the time being so that I can do my job (because 1 our of 10 articles contain Twitter embed posts and I have new employees every month which fall into the drap and upload corrupted articles). Finally, I hope that this is fixed with an update in the next version.
ps. This has been discussed in a previous forum topic which has 404 error, probably due to the Twitter code as well.