Steps to reproduce:

1. Acoording to the docs the zabix agent key service.info[<service_name>] return code 255 if the sewrvice does not exist.
2. It works fine in zabbix agent 1
3. I zabbix agent 2 the check returns "Unsupported item"
   zabbix_get -s 172.24.5.21 -k "service.info[non_existing_service]"
   ZBX_NOTSUPPORTED: The specified service does not exist as an installed service.

Result:
The monitoring item for service existence become unsupported.
Expected:
Return code 255 as described in docs and works in agent 1