Steps to reproduce:

1. Create an item for a registered host with net.tcp.service[tcp,,8081]
2. Have a service running on that machine with port opened using the IPv4 instead of localhost or 127.0.0.1 (example kafka, schema registry, zookeeper, etc.)

Result:

1. Run zabbix_agentd -t net.tcp.service[tcp,,8081] on that host
2. result is 0 instead of 1, even though netstat shows the port is listening against the IPv4

Expected:
Return 1.

This used to work for v3.4; when we upgraded agent to 4.2 it doesnt return 1 no more.