Had this happen with several of my cars, but not my diesels. I've never been concerned about it. Can't remember if it happens in my V cuz i usually down shift. Will check V later. I'm kind of assuming it's not a big deal tho.
I had the same type of occurrences in mine. The car sounds fine and I don't hear any odd vibrations when it happens. I think it's just the flywheel maintaining it's momentum before the friction takes over and slows it down to idle completely. I could be wrong and that's what I think it is. Ultimately, I think its fine but do update if anything comes up. This could be something I need to watch for.
When reading up on lightweight flywheels for these motors it was mentioned that the flywheel in these cars are intentionally heavy for better driveability with new/inexperienced manual transmission drivers. Just rev your Versa up and see how long it takes to come back down to idle, it's nuts. Versaspeed says the OEM is like 30.4 LB's or something like that, and their lightweight one is 11 or so. Frankly i'm just waiting for either my tranny or clutch needing replacement as an excuse to put that lightweight flywheel in there. Deffinitely more responsive then! Then again, i also just sunk $2500 in more parts for my 928 S4 project car.