This is related to #14150 and possibly others, but it's actually a separate issue.

For instance, when using the following query:
`bitcoin-cli scantxoutset start '[{"desc":"wpkh(xpubABCDEF/0/*)", "range":100}]'`
I can get a list of UTXOs, but no way to get back the index which derived that particular UTXO. So it's not much better than deriving on the user side and specifying addresses one by one, so that I already have a cache of addresses to match.

Not sure what the solution looks like. One way is to repeat the full descriptor in the utxo. That might get verbose though.
throw JSONRPCError(RPC_CLIENT_IN_INITIAL_DOWNLOAD, "Cannot set a new HD seed while still in Initial Block Download");
    }
    LOCK2(cs_main, pwallet->cs_wallet);
    
    if (!pwallet->IsHDEnabled()) {
        throw JSONRPCError(RPC_WALLET_ERROR, "Cannot set a HD seed on a non-HD wallet. Start with -upgradewallet in order to upgrade a non-HD wallet to HD");
    }
    EnsureWalletIsUnlocked(pwallet);
    bool flush_key_pool = true;
    if (!request.params[0].isNull()) {
        flush_key_pool = request.params[0].get_bool();
    }
    CPubKey master_pub_key;
    if (request.params[1].isNull()) {
        master_pub_key = pwallet->GenerateNewSeed();
    } else {
        CKey key = DecodeSecret(request.params[1].get_str());
        if (!key.IsValid()) {
            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid private key");
        }
        if (HaveKey(*pwallet, key)) {
            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Already have this key (either as an HD seed or as a loose private key)");
        }
        master_pub_key = pwallet->DeriveNewSeed(key);
    }
    pwallet->SetHDSeed(master_pub_key);
    if (flush_key_pool) pwallet->NewKeyPool();
    return NullUniValue;
}
void AddKeypathToMap(const CWallet* pwallet, const CKeyID& keyID, std::map<CPubKey, KeyOriginInfo>& hd_keypaths)