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.
{
    std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
    CWallet* const pwallet = wallet.get();
    if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
        return NullUniValue;
    }
    if (request.fHelp || request.params.size() != 0)
        throw std::runtime_error(
            "resendwallettransactions\n"
            "Immediately re-broadcast unconfirmed wallet transactions to all peers.\n"
            "Intended only for testing; the wallet code periodically re-broadcasts\n"
            "automatically.\n"
            "Returns an RPC error if -walletbroadcast is set to false.\n"
            "Returns array of transaction ids that were re-broadcast.\n"
            );
    if (!g_connman)
        throw JSONRPCError(RPC_CLIENT_P2P_DISABLED, "Error: Peer-to-peer functionality missing or disabled");
    LOCK2(cs_main, pwallet->cs_wallet);
    if (!pwallet->GetBroadcastTransactions()) {
        throw JSONRPCError(RPC_WALLET_ERROR, "Error: Wallet transaction broadcasting is disabled with -walletbroadcast");
    }
    std::vector<uint256> txids = pwallet->ResendWalletTransactionsBefore(GetTime(), g_connman.get());
    UniValue result(UniValue::VARR);
    for (const uint256& txid : txids)
    {
        result.push_back(txid.ToString());
    }
    return result;
}
static UniValue listunspent(const JSONRPCRequest& request)