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::shared_ptr<CWallet> const pwallet = GetWalletForJSONRPCRequest(main_request);
    if (!pwallet) return UniValue::VNULL;
    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);