When network discovery detects multiple IP addresses with the same SNMP sysName, the existing host's main interface IP address gets overwritten.

Steps to reproduce:

1. Configure a discovery rule with:
   Type: SNMP agent
   SNMP OID: 1.3.6.1.2.1.1.5.0 (sysName)
   Uniqueness criteria: SNMP sysName
   
2. Have a device with multiple IP addresses that return the same sysName via SNMP
3. Run the discovery rule
4. Observe that the discovered host's interface IP address gets overwritten
   Detected interfaces in 7.0.16
   
   Main IP address gets overwritten in 7.0.17
   
   Result:
   Zabbix Server: 7.0.17
   Previously working version: 7.0.16
   Root cause appears to be ZBX-25545 changes to zbx_db_add_interface() function.
   This was intended for autoregistration but affects network discovery as well.
   Autidilog excerpt:

   Description: 192.168.11.242
   
   host.interfaces[48].details.ip: 192.168.11.196 => 192.168.11.202