Steps to reproduce:
 
1. Setup a zabbix-agent host with three IP addresses:

ens18: <BROADCAST,MULTICAST,UP,LOWER_UP>     
inet 10.42.0.23/22 brd 10.42.3.255 scope global dynamic noprefixroute ens18     
inet 10.42.0.27/22 scope global secondary ens18     
inet 10.42.0.28/22 scope global secondary ens18  

2. Configure a Network discovery rule with two agent checks: system.hostname and system.uname. Set Device unique criteria to "system.hostname"

3. Observe Discovery result
 
Result:

• Grouping of discovered IPs does not appear to be consistent

Expected:

• Grouping should properly reflect device uniqueness criteria
   

References

• ZBX-27200 Wrong network discovery behavior on hosts with multiple IP addresses