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 
{
    std::shared_ptr<CWallet> const pwallet = GetWalletForJSONRPCRequest(main_request);
    if (!pwallet) return NullUniValue;
    CWallet& wallet{*pwallet};
    // 
    // 
    wallet.BlockUntilSyncedToCurrentChain();
    //  
    if (!pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
        throw JSONRPCError(RPC_WALLET_ERROR, "importdescriptors is not available for non-descriptor wallets");
    }
    RPCTypeCheck(main_request.params, {UniValue::VARR, UniValue::VOBJ});
    WalletRescanReserver reserver(*pwallet);
    if (!reserver.reserve()) {
        throw JSONRPCError(RPC_WALLET_ERROR, "Wallet is currently rescanning. Abort existing rescan or wait.");
    }
    const UniValue& requests = main_request.params[0];
    const int64_t minimum_timestamp = 1;
    int64_t now = 0;
    int64_t lowest_timestamp = 0;
    bool rescan = false;
    UniValue response(UniValue::VARR);
    {
        LOCK(pwallet->cs_wallet);
        EnsureWalletIsUnlocked(*pwallet);
        CHECK_NONFATAL(pwallet->chain().findBlock(pwallet->GetLastBlockHash(), FoundBlock().time(lowest_timestamp).mtpTime(now)));
        // 
        for (const UniValue& request : requests.getValues()) {
            // 
            const int64_t timestamp = std::max(GetImportTimestamp(request, now), minimum_timestamp);