Tested in v0.21.0

```
createmultisig 1 '["04ceba29da1af96a0f2ef7cda6950b8be2baeb1adf12c0d5efebb70dbcaa086ba029cd82a0cfb8dedf65b8760cf271f2b8a50466bbf0b9339c5ffefbe2a4165326"]' p2sh-segwit
{
  "address": "3LfGXVPHtrC9A99JNiAPnygnQuPdpASvN3",
  "redeemScript": "514104ceba29da1af96a0f2ef7cda6950b8be2baeb1adf12c0d5efebb70dbcaa086ba029cd82a0cfb8dedf65b8760cf271f2b8a50466bbf0b9339c5ffefbe2a416532651ae",
  "descriptor": "sh(multi(1,04ceba29da1af96a0f2ef7cda6950b8be2baeb1adf12c0d5efebb70dbcaa086ba029cd82a0cfb8dedf65b8760cf271f2b8a50466bbf0b9339c5ffefbe2a4165326))#dyera70q"
}
```
same result for:
```
createmultisig 1 '["04ceba29da1af96a0f2ef7cda6950b8be2baeb1adf12c0d5efebb70dbcaa086ba029cd82a0cfb8dedf65b8760cf271f2b8a50466bbf0b9339c5ffefbe2a4165326"]' bech32
```

Best if this throws an error telling the user it won't make a nonstandard address.

if (pwallet->GetKeyPoolSize() < kpSize) {
        throw JSONRPCError(RPC_WALLET_ERROR, "Error refreshing keypool.");
    }
    return NullUniValue;
},
    };
}
RPCHelpMan newkeypool()
{
    return RPCHelpMan{"newkeypool",
                "\nEntirely clears and refills the keypool."+
            HELP_REQUIRING_PASSPHRASE,
                {},
                RPCResult{RPCResult::Type::NONE, "", ""},
                RPCExamples{
            HelpExampleCli("newkeypool", "")
            + HelpExampleRpc("newkeypool", "")
                },
        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
{
    std::shared_ptr<CWallet> const pwallet = GetWalletForJSONRPCRequest(request);
    if (!pwallet) return NullUniValue;
    LOCK(pwallet->cs_wallet);
    LegacyScriptPubKeyMan& spk_man = EnsureLegacyScriptPubKeyMan(*pwallet, true);
    spk_man.NewKeyPool();
    return NullUniValue;
},
    };
}
class DescribeWalletAddressVisitor