Regarding the issue of not being able to identify the Wi-Fi interface of an iPhone device

I am obtaining the IP address in the Wi-Fi connection of an iPhone using the following source code. Howerver, I obtained completely different results on different models (iPhone XR, iPhone 13) with the same OS (iOS16.4.1).

Do you happen to know the cause of this?

【Code】

class Wifi { enum connectionStatusItem { case unknown case onlineWifi }

class func connectionStatus() -> connectionStatusItem {
    var valid = false

    //Get list of all interfaces on the iPhone
    var ifa : UnsafeMutablePointer<ifaddrs>? = nil
    if getifaddrs(&ifa) == 0 {
        var p = ifa

        //For each interface
        while p != nil {
            defer {
                p = p?.pointee.ifa_next
            }
            let ifp = p?.pointee
            let fam = ifp?.ifa_addr.pointee.sa_family

            //Check for IPv4 or IPv6 interface
            if fam == UInt8(AF_INET) || fam == UInt8(AF_INET6) {

                //Check Wi-Fi interface
               //<-------------- 'if' statement not executing on iPhone13(iOS16.3.1) and  iPhone13(iOS16.4.1)
                if String(cString: (ifp?.ifa_name)!) == "en0" {          
                    
                    //Convert interface address to a human readable string
                    var addr = ifp?.ifa_addr.pointee
                    var host = [CChar](repeating: 0, count: Int(NI_MAXHOST))
                    getnameinfo(&addr!,
                                socklen_t((addr?.sa_len)!),
                                &host,
                                socklen_t(host.count),
                                nil,
                                socklen_t(0),
                                NI_NUMERICHOST
                    )
                    var hosts: String?
                    hosts = String(cString: host)
                    valid = hosts != nil
                }
            }
        }
        freeifaddrs(ifa)
    }

    let ret : connectionStatusItem = valid ? .onlineWifi : .unknown

    return ret
}

}

【Results】 　success iPhone13【iOS 16.1.1】 　success iPhone13【iOS 16.2.1】 　failure iPhone13【iOS 16.3.1】 <------------------------- ✖ 　success iPhone13【iOS 16.4】 　failure iPhone13【iOS 16.4.1】 <------------------------- ✖ 　success iPhoneXR【iOS 16.4.1】 　success iPhone13【iOS 16.4.1(a)】