Steps to reproduce:

* Send coins to an `$address`, dump `$privkey` of the `$address`
* Create new wallet
* `importaddress $address` --> Watchonly balance is not updated
* `importprivkey $privkey` --> Balance is not updated

Needs a restart to get fixed. See also #11477 
UniValue warnings(UniValue::VARR);
    UniValue result(UniValue::VOBJ);
    try {
        if (!data.exists("desc")) {
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Descriptor not found.");
        }
        const std::string& descriptor = data["desc"].get_str();
        const bool active = data.exists("active") ? data["active"].get_bool() : false;
        const bool internal = data.exists("internal") ? data["internal"].get_bool() : false;
        const std::string& label = data.exists("label") ? data["label"].get_str() : "";
        // 
        FlatSigningProvider keys;
        std::string error;
        auto parsed_desc = Parse(descriptor, keys, error, /* rue);
        if (!parsed_desc) {
            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, error);
        }
        // 
        int64_t range_start = 0, range_end = 1, next_index = 0;
        if (!parsed_desc->IsRange() && data.exists("range")) {
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Range should not be specified for an un-ranged descriptor");
        } else if (parsed_desc->IsRange()) {
            if (data.exists("range")) {
                auto range = ParseDescriptorRange(data["range"]);
                range_start = range.first;
                range_end = range.second + 1; // 
            } else {
                warnings.push_back("Range not given, using default keypool range");
                range_start = 0;
                range_end = gArgs.GetIntArg("-keypool", DEFAULT_KEYPOOL_SIZE);