Item data from inventory function not getting passed to check function in checkmk 2.0

Hi, im developing extensions for monitorizing SNMP on checkmk 2.0, i built my plugins on version 1.6 but they are running on legacy mode, my problem is that i cant access data returned by inventory function from check function, item argument is always none, but the item number is passed to the service description so i dont know whats wrong with it

#!/usr/bin/env python3

# factory_settings["DellOS9_10_power"] = {
#     "warn": (999, 999)
#     }


def inventory_DellOS9_10_power(info):
    if info:
        i = 0
        for line in info:
            yield (str(i), None)
            i += 1


def check_DellOS9_10_power(item, params, info):
    try:
        i = 0
        for line in info:
            power = line[0]
            power = int(power)
            if str(i) == item:
                status = 0
                if power >= 999:
                    status = 1
                if power >= 999:
                    status = 2
                perfdata = [ ('power', power, 999, 999 ) ]
                return (status, 'Power Usage: ' + str(power), perfdata)
            i += 1
    except ValueError:
        print("Error", ValueError)
        return 2, "No data"







check_info["dellos_power"] = {
    "check_function": check_DellOS9_10_power,
    "inventory_function": inventory_DellOS9_10_power,
    "service_description": "Power Supply: ",
    "has_perfdata": True,
    "snmp_info": (
        ".1.3.6.1.4.1.674.10895.3000.1.2.110.7.2.1",
        [
            "5",  # Power
        ],
    ),
    "snmp_scan_function": lambda oid: oid(".1.3.6.1.2.1.1.2.0") != "",
}