get_occurence_of_value not returning exact count if the value is list

Created by: rameshrvr

sample4 = {
            "values": [{
                "checks": [{
                    "monitoring_zones":
                    ["mzdfw", "mzfra", "mzhkg", "mziad",
                     "mzlon", "mzord", "mzsyd"]
                }]
            }]
        }

For the above document if i am searching for the occurrence of value 'mzhkg'. It should return 1 but it is returning 0 since it can't able to lookup inside a value if it is a list