Very odd. If they are humbuckers, then why does Fender say they are single coil? Here is a snip from Fender's website regarding the N3 Noiseless Jazz bass pickups (the ones in my American Deluxe Jazz):
General
Model Name: N3 Noiseless Jazz Bass® Pickups
Series: Fender
Color / Part #:
Black
099-3117-000
Black
099-3117-001
Black
099-3117-002
Miscellaneous
Additional Comments: DC Resistance: 9.2K (Bridge) or 8.0K (Neck); AlNiCo 5 (Bridge) or 3 (Neck) Magnets; Single-Coil Pickups with Black Pickup Covers
If they say (and are) "noiseless" you can be sure they are not single coil. But what they actually are seems to be a mystery!
I own a MIM Fender Deluxe V that came with "noiseless" pickups. Tone was FAR less than optimum. I lived with it a couple of years and finally scored a set of Fender SCN humfree pickups to replace them assuming the problem was the usual tone of "stacked coil" pickups.
Now here's where it gets all fuzzy. So I install the SCN pickups and the bass simply comes alive! But dig. the original pickups were NOT "stacked coil" They were side by side coils (Like most after market humfree pickups) and the new SCN pickups that sounded so great actually WERE stacked coils! What? And I read that the SCNs (in spite of being discontinued for sale separately) were supposed to be the "standard" pickup on the American Deluxe Vers. But now you look at your reference from Fender and that seems wrong too! Who knows what they are putting in there now?
From what I've seen all recent model Fender Deluxe 5 strings have been reworked and have wonderful B strings. (Mine unfortunately is older with less than stellar B string, though MUCH better with new pickups) But I've seen people rave about the tone and others complain and change pickups. Is it due to pickups differences or just people's taste in tone? I don't know, but there does seem to be a Fender consistency problem here.