This differs from behaviour of `importaddress` where it works.
```
$ bitcoin-cli importaddress "<address>" "<label>" false
```
vs
```
$ bitcoin-cli importmulti '[{ "scriptPubKey": { "address": "<address>" }, "timestamp":0, "label": "<label>", "watchonly": true }]' '{ "rescan": false }'
error code: -13
error message:
Error: Please enter the wallet passphrase with walletpassphrase first.
```
std::stringstream ret;
    for (const unsigned char c : str) {
        if (c <= 32 || c >= 128 || c == '%') {
            ret << '%' << HexStr({&c, 1});
        } else {
            ret << c;
        }
    }
    return ret.str();
}
static std::string DecodeDumpString(const std::string &str) {
    std::stringstream ret;
    for (unsigned int pos = 0; pos < str.length(); pos++) {
        unsigned char c = str[pos];
        if (c == '%' && pos+2 < str.length()) {
            c = (((str[pos+1]>>6)*9+((str[pos+1]-'0')&15)) << 4) |
                ((str[pos+2]>>6)*9+((str[pos+2]-'0')&15));
            pos += 2;
        }
        ret << c;
    }
    return ret.str();
}
static bool GetWalletAddressesForKey(const LegacyScriptPubKeyMan* spk_man, const CWallet& wallet, const CKeyID& keyid, std::string& strAddr, std::string& strLabel) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
{