problem with saving changes in articles

I can't add text to the new articles using Zero App.
I can add a photo, title, alternative text, and date and it all shows up on the article page.
Unfortunately, the main text is not displayed on the page.
In addition, when I make even a small edit to an article already added - The whole description suddenly disappears and cannot be restored.
First screen - edit page. Second screen - this is what the article looks like on the site.

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