Steps to reproduce:

1. UserParameter=system.test,who | wc -l

1. zabbix_agent2 -v -t system.test

1. /etc/zabbix$ ls -l
   total 20
   -rw-r--r-- 1 zabbix zabbix 11939 Jul 6 01:56 zabbix_agent2.conf
   drwxr-xr-x 2 zabbix zabbix 4096 Jun 27 17:52 zabbix_agent2.d

1. However It works from zabbix_server with zabbix_get and also with zabbix_agentd
2. Note, Agent version is 4.4.9 but I can not select that version. Agent is installed using official repository/ppa.

Result:

[m|ZBX_NOTSUPPORTED] [Unknown metric system.test]

Expected:
1 (An integer value)