https://github.com/bitcoin/bitcoin/blob/d72758c3f6c34cd835f5de3efc230964f3b1ea56/src/torcontrol.cpp#L539

If a user is running Tor proxy outside localhost (perhaps on other host inside LAN or in containerised environment) , the automatic creation of onion services ends up creating an onion service listening to hardcored 127.0.0.1 address on the Tor proxy's host instead of the private address of the bitcoind – effectively running an empty onion service listening the Tor proxy's localhost.
}
    int nSelect = select(hSocketMax + 1, &fdsetRecv, &fdsetSend, &fdsetError, &timeout);
    if (interruptNet)
        return;
    if (nSelect == SOCKET_ERROR)
    {
        int nErr = WSAGetLastError();
        LogPrintf("socket select error %s\n", NetworkErrorString(nErr));
        for (unsigned int i = 0; i <= hSocketMax; i++)
            FD_SET(i, &fdsetRecv);
        FD_ZERO(&fdsetSend);
        FD_ZERO(&fdsetError);
        if (!interruptNet.sleep_for(std::chrono::milliseconds(SELECT_TIMEOUT_MILLISECONDS)))
            return;
    }
    for (SOCKET hSocket : recv_select_set) {
        if (FD_ISSET(hSocket, &fdsetRecv)) {
            recv_set.insert(hSocket);
        }
    }
    for (SOCKET hSocket : send_select_set) {
        if (FD_ISSET(hSocket, &fdsetSend)) {
            send_set.insert(hSocket);
        }
    }
    for (SOCKET hSocket : error_select_set) {
        if (FD_ISSET(hSocket, &fdsetError)) {
            error_set.insert(hSocket);
        }
    }