A user reported to me that they are unable to create a PSBT with a legacy watchonly wallet when they use the GUI. They get an error "The amount exceeds your balance".

I think the issue is that the GUI will retrieve the wallet's balance via `AvailableCoins` before calling `CreateTransaction`. This call to `AvailableCoins` is resulting in fewer coins being returned with recent changes to how `AvailableCoins` works, particularly with additional filtering of spendable coins and preset coins.

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Note that this does not effect descriptor wallets. A workaround for this issue is to switch to using descriptor wallets. An existing legacy wallet can be turned into a descriptor wallet using the `migratewallet` RPC. However many watchonly legacy wallets are likely the result of importing descriptors via `importmulti`. For such wallets, I recommend creating a new descriptor wallet and re-importing the descriptors.
std::vector<std::vector<uint8_t>> script_solutions;
            TxoutType type = Solver(output.scriptPubKey, script_solutions);
            
            
            
            
            bool is_from_p2sh{false};
            if (type == TxoutType::SCRIPTHASH && solvable) {
                CScript script;
                if (!provider->GetCScript(CScriptID(uint160(script_solutions[0])), script)) continue;
                type = Solver(script, script_solutions);
                is_from_p2sh = true;
            }
            result.Add(GetOutputType(type, is_from_p2sh),
                       COutput(outpoint, output, nDepth, input_bytes, spendable, solvable, safeTx, wtx.GetTxTime(), tx_from_me, feerate));
            
            if (params.min_sum_amount != MAX_MONEY) {
                if (result.GetTotalAmount() >= params.min_sum_amount) {
                    return result;
                }
            }
            
            if (params.max_count > 0 && result.Size() >= params.max_count) {
                return result;
            }
        }
    }
    return result;
}
CoinsResult AvailableCoinsListUnspent(const CWallet& wallet, const CCoinControl* coinControl, CoinFilterParams params)