The problem that printers are shown twice is still open.

I use
SLES 12.3:
AVAHI-deamon runs.
I use HP device Manager
Firewall: Internal (desktop), so all ports are open
No problem, printer is shown only once.

SLED 12.3 (previouse)
AVAHI-deamon runs.
I use HP device Manager
Firewall: External (Laptop), but several ports for HP communication are open.
9100, 161,5353,162,427 both TCP and UDP
No problem, printer is shown only once.

SLED 15.1 (now)
AVAHI-deamon runs.
I use HP device Manager
Firewall: External (Laptop), but several ports for HP communication are open.
9100, 161,5353,162,427 both TCP and UDP
Problem, printer is shown only once.

What makes the difference?