Following a discussion that I started firstly on the Bitcoin dev's mailing list, and then on StackExchange and Reddit, regarding some weird inconsistencies I noticed when I was working on a function to derive the p2sh from a multisig script, I'm here now to report what seems to be a bug in `addmultisigaddress` method.

Reference of the discussions:
https://bitcoin.stackexchange.com/questions/87579/multisig-scripts-hashing-p2sh-difference-between-legacy-and-segwit
https://www.reddit.com/r/Bitcoin/comments/bmiuk5/multisig_scripts_hashing_p2sh_difference_between/

## Example:

```bash
bitcoin-cli addmultisigaddress 1 '["045897fee25bd7c5692510b2f50fcae9aa20fbc4d49d59814f4c7fdb5c4bc6eb1c0ce382458f9588e922e0d509ed8d34856787380075b00418b02e0bf7c652ef9d","02ac46c6d74d15e60f4f1035ff07ef740aca1d68d55ba0b8d336a73d7a35858831","0224a4dc5620714a9ecf67a09583d1e4c04f5bedb8ecea99028da05bb15a2a7e07"]'
{
  "address": "36ULucjWUTrDvaJzCyhFoVbDoNS6Zum2Du",
  "redeemScript": "5141045897fee25bd7c5692510b2f50fcae9aa20fbc4d49d59814f4c7fdb5c4bc6eb1c0ce382458f9588e922e0d509ed8d34856787380075b00418b02e0bf7c652ef9d2102ac46c6d74d15e60f4f1035ff07ef740aca1d68d55ba0b8d336a73d7a35858831210224a4dc5620714a9ecf67a09583d1e4c04f5bedb8ecea99028da05bb15a2a7e0753ae"
}

bitcoin-cli createmultisig 1 '["045897fee25bd7c5692510b2f50fcae9aa20fbc4d49d59814f4c7fdb5c4bc6eb1c0ce382458f9588e922e0d509ed8d34856787380075b00418b02e0bf7c652ef9d","02ac46c6d74d15e60f4f1035ff07ef740aca1d68d55ba0b8d336a73d7a35858831","0224a4dc5620714a9ecf67a09583d1e4c04f5bedb8ecea99028da05bb15a2a7e07"]'
{
  "address": "3GiimyxF1R5VixfBFAbQZbuy9EesD2r6n1",
  "redeemScript": "5141045897fee25bd7c5692510b2f50fcae9aa20fbc4d49d59814f4c7fdb5c4bc6eb1c0ce382458f9588e922e0d509ed8d34856787380075b00418b02e0bf7c652ef9d2102ac46c6d74d15e60f4f1035ff07ef740aca1d68d55ba0b8d336a73d7a35858831210224a4dc5620714a9ecf67a09583d1e4c04f5bedb8ecea99028da05bb15a2a7e0753ae"
}
```

## Expected behaviour:

Both the two calls should return the same legacy address, because `addmultisigaddress` uses p2sh-segwit which is the default address type for the wallet, but segwit does not support uncompressed keys, so the first call should fallback to legacy.

## Actual behaviour:

The first call is returning an invalid segwit address.

@achow101 answered to my email to the dev list and also to my question on StackExchange and he believes that this is a bug and it could be related to the fact that the uncompressed pubkey is not part of my wallet.

---

Another interesting thing is that, as user @ugamkamat pointed out on StackExchange, changing the position of the uncompressed public key from the first to the last, the first call returns a legacy address:

```bash
./bitcoin-cli addmultisigaddress 1 '["02ac46c6d74d15e60f4f1035ff07ef740aca1d68d55ba0b8d336a73d7a35858831","0224a4dc5620714a9ecf67a09583d1e4c04f5bedb8ecea99028da05bb15a2a7e07","045897fee25bd7c5692510b2f50fcae9aa20fbc4d49d59814f4c7fdb5c4bc6eb1c0ce382458f9588e922e0d509ed8d34856787380075b00418b02e0bf7c652ef9d"]'
{
  "address": "35RZ8AHKWGGbNcRDaCUtznSVnPRWGqVPJu",
  "redeemScript": "512102ac46c6d74d15e60f4f1035ff07ef740aca1d68d55ba0b8d336a73d7a35858831210224a4dc5620714a9ecf67a09583d1e4c04f5bedb8ecea99028da05bb15a2a7e0741045897fee25bd7c5692510b2f50fcae9aa20fbc4d49d59814f4c7fdb5c4bc6eb1c0ce382458f9588e922e0d509ed8d34856787380075b00418b02e0bf7c652ef9d53ae"
}
```

I'd really like to try to contribute to the project, so I'm trying to figure out where the problem could be in the code. Any suggestion is welcome.
{
    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() < 1 || request.params.size() > 2)
        throw std::runtime_error(
            RPCHelpMan{"getreceivedbyaddress",
                "\nReturns the total amount received by the given address in transactions with at least minconf confirmations.\n",
                {
                    {"address", RPCArg::Type::STR, RPCArg::Optional::NO, "The bitcoin address for transactions."},
                    {"minconf", RPCArg::Type::NUM,  "1", "Only include transactions confirmed at least this many times."},
                },
                RPCResult{
            "amount   (numeric) The total amount in " + CURRENCY_UNIT + " received at this address.\n"
                },
                RPCExamples{
            "\nThe amount from transactions with at least 1 confirmation\n"
            + HelpExampleCli("getreceivedbyaddress", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\"") +
            "\nThe amount including unconfirmed transactions, zero confirmations\n"
            + HelpExampleCli("getreceivedbyaddress", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" 0") +
            "\nThe amount with at least 6 confirmations\n"
            + HelpExampleCli("getreceivedbyaddress", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" 6") +
            "\nAs a JSON-RPC call\n"
            + HelpExampleRpc("getreceivedbyaddress", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\", 6")
                },
            }.ToString());