Hmm, I have not often encountered a book that had a layout like that. I have dim memories of maybe seeing that once or twice—and come to think of it, that might have even been for parts rather than chapters—but I just pulled down a dozen or so books off of shelves, of varying topics fiction and non-fiction alike, and found these practices among them:
No page break at all, chapter numbers or headings are inserted in the stream of text as they come.
No forcing the chapter to fall on recto or verso, but chapter headings always come at the top of the page.
Always recto, but if the prior chapter ends on the matching verso, nothing special is done.
I couldn’t a find a single example like you described. That doesn’t mean there are none in my library of course, but it doesn’t seem common. That also doesn’t mean you shouldn’t do that, to be clear, you can do whatever you want. I’m just saying it doesn’t strike me as being any more “professional” than the above, or by the options provided in Scrivener. So if that’s all you were concerned about, you can be assured that nobody will find your book unprofessional even if chapter 21 starts in the middle of the verso page, with paragraph text above it from chapter 20. Personal opinion, I prefer that very option for Kindle, anyway. I’d rather not waste battery flipping pages between chapters if possible.
If that’s the look you really want though, you’ll have to use the blank page token manually, and take care to proof every chapter break after compile.
I actually researched this when I implemented the feature, and in very book I have that has parts and chapters, there is no extra blank page before a part - the part just starts on a recto page. I have attached images from the first six books I just grabbed that have parts and chapters in them. There may well be books that do insert an extra blank page, but the way Scrivener does it is certainly common so won’t be considered wrong.
You are suggesting that there is a completely blank paper between chapters. I did like Keith and checked a lot of my books, both fiction and non-fiction, and none of them had anything like what you are suggesting. AmberV’s short list of alternatives covered all the books I checked. The more expensive books all hade either of AmberV’s alternative 2 or 3.
You had me thinking: I’ve read a lot of books — fiction and (especially over the last 10-15 years) non-fiction — and I couldn’t think of any that had a blank page between chapters. But rather than trust memory, I decided to have a look. I chose a random selection of books across various genres (including poetry) and across multiple disciplines (including art, history, psychology, religion, cultural studies, physics, philosophy, and more). To minimise the influence of publication date, I included books published every decade since the 50s (plus one prized 1910 reprint of an 1888 monolith). I won’t say it was methodical, but I did check close to 20 books (not intentionally, I just enjoyed revisiting some of these books and kept going to see what else I’d find*).
For the record, the most common practice was to start a chapter on the page immediately following the previous chapter, regardless of whether it was recto or verso. Only a few books started every chapter recto and about as many started chapters on the same page the previous chapter ended (two of these books started new sections recto).
I could not find any examples of a complete blank page (blank both verso and recto) between chapters or parts. This is not to say that no books have this, only that I was not able to find any. Given that there are now a few of us who have checked, this suggests that double-sided blank page between chapters is, at best, uncommon.
[size=85]For example, I discovered my mother’s 1963 paperback edition of Truman Capote’s Breakfast at Tiffany’s. I’d forgotten he wrote it, let alone that I had a copy on my shelves*, so the exercise was definitely worthwhile.
**I haven’t even read it. No points for guessing what’s just been added to my book pile… [/size]
not wanting to spoil the ending completely, but when it turned out that George Peppard had been dead all along… Man such a lame twist. They should have stuck with the original ending when they catch the monkey in time to create the antidote.
I’m just saying it doesn’t strike me as being any more “professional” than the above, or by the options provided in Scrivener. So if that’s all you were concerned about, you can be assured that nobody will find your book unprofessional even if chapter 21 starts in the middle of the verso page, with paragraph text above it from chapter 20. 
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