The Fox Sports list shows Dez playing 16 games, with 6 drops, tied with 3 others for third most. Same for NBC Sports.
But "Analytics service Inside Edge says Bryant's dropped 10 balls this season, tied for most among NFL receivers." But as they also said "How many he's dropped, exactly, depends on the stats keepers you look to." And it also notes the sun factor at AT&T stadium was a factor, which we've all seen of course.
Washington Post says 6,
I would say some of the sites don't seem to have the year listed anywhere but I searched for 2017 NFL wide receiver drops so I'm assuming that it's for 2017.
Seems the majority of sites don't say any receiver dropped 10 passes, even Lee.