I run code below on Pixel 3A with Android 11.
It prints:

QNetworkInterface::Unknown QHostAddress("10.108.19.194") QAbstractSocket::IPv4Protocol "rmnet_data1"
QNetworkInterface::Unknown QHostAddress("192.168.1.121") QAbstractSocket::IPv4Protocol "wlan0"
QNetworkInterface::Unknown QHostAddress("127.0.0.1") QAbstractSocket::IPv4Protocol "lo"

As can you see `ifc.type()` always return `QNetworkInterface::Unknown`.
I expect QNetworkInterface::Wifi for "wlan0", 192.168.1.121 this is address that gives wifi router to phone, "rmnet_data1" is 4G network interface (have no idea what proper QNetworkInterface::InterfaceType), and "lo" should have QNetworkInterface::Loopback type.

    auto interfaces = QNetworkInterface::allInterfaces();
    for (const auto &ifc : interfaces) {
        const auto container = ifc.addressEntries();
        for (const auto &addr : container) {
            qDebug() << ifc.type() << addr.ip() << addr.ip().protocol() << ifc.name();
        }
    }