Gave the new CT a second chance - and it failed to translate at all. Trifles (play) from english to russian. Tried many times with Google and Yandex - "Automatic translation failed!". Old version is translating (and this article too). I will delete unfinished translation and keep this article untranslated for a while to reproduce error.
Topic on Talk:Content translation
2 days passed. "Automatic translation failed!". This particular article can't be translated. Unusual that CT cant't see paragraphs in this article and tries to translate all the text.
Thanks for the feedback, @Igel B TyMaHe.
Content Translation divides content into paragraphs, but it is failing for this particular issue. The whole document is treated as a paragraph and that probably exceeds the character limit for translation service requests.
Dividing the articles into paragraphs has been working quite reliably, and I'm not sure what may be causing this particular article to fail. I created a ticket to capture this issue and do further investigation. Feel free to add further comments and track the progress of the ticket.