Twice now, after an oil change, I have seen a small amount of oil under the bike:
As you can see, it is on the right side. After a careful look, the source of the oil has been found:
I have made inquiries about where the tube originates; perhaps the air box. The crankcase may vent there and dump some oil after a change. Will advise when I know more. This is not likely to be a big deal. It seems to be a temporary condition that goes away - likely because the oil level burns off a bit with use.