I bought a couple Haskaps from Maxine Thompson a while ago and planted them in the ground.They grew fine for a few years.Then it seemed like overnight,one plant had necrotic leaves,like your photo,with some defoliation.
I emailed Dr.Thompson and sent some pictures,but she couldn’t say why it happened.I thought maybe someone poured poison on the plant.
But like moose wrote,things were okay the next growing season.bb