I can think of more than a few reasons why it has a Jazz-spec'd neck, but they're a bit on the outlandish/unlikely side. Outside someone swapping necks and relabeling it, I can only guess that it was a factory-level error. Regardless, even if it's a Jazz neck, it has little impact on the body. If it's a VM, it'll likely take a Fender Standard guard.
On a related note, it's times like this I wish Fender/Squier hadn't decided to give no series-designation to their VM and CV lines. Rare as it may be, it makes proper identification a real headache, especially when I see so many mislabeled, used instruments up for sale. It irks me when someone tries to pass off a white VM Jazz as a CV to squeeze an extra $50+ out of someone who doesn't know better.
I suppose I shouldn't complain, though. I once got a used CV Jazz from Guitar Center for the price of a used VM…$205 and with a case to boot!