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.
std::vector<uint8_t> computedClientHash = ComputeResponse(TOR_SAFE_CLIENTKEY, cookie, clientNonce, serverNonce);
            _conn.Command("AUTHENTICATE " + HexStr(computedClientHash), std::bind(&TorController::auth_cb, this, std::placeholders::_1, std::placeholders::_2));
        } else {
            LogPrintf("tor: Invalid reply to AUTHCHALLENGE\n");
        }
    } else {
        LogPrintf("tor: SAFECOOKIE authentication challenge failed\n");
    }
}
void TorController::protocolinfo_cb(TorControlConnection& _conn, const TorControlReply& reply)
{
    if (reply.code == 250) {
        std::set<std::string> methods;
        std::string cookiefile;
        /*
         * 250-AUTH METHODS=COOKIE,SAFECOOKIE COOKIEFILE="/home/x/.tor/control_auth_cookie"
         * 250-AUTH METHODS=NULL
         * 250-AUTH METHODS=HASHEDPASSWORD
         */
        for (const std::string &s : reply.lines) {
            std::pair<std::string,std::string> l = SplitTorReplyLine(s);
            if (l.first == "AUTH") {
                std::map<std::string,std::string> m = ParseTorReplyMapping(l.second);
                std::map<std::string,std::string>::iterator i;
                if ((i = m.find("METHODS")) != m.end())
                    boost::split(methods, i->second, boost::is_any_of(","));
                if ((i = m.find("COOKIEFILE")) != m.end())
                    cookiefile = i->second;
            } else if (l.first == "VERSION") {
                std::map<std::string,std::string> m = ParseTorReplyMapping(l.second);