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.
QCOMPARE(amountInput->value(), CAmount(0));
    QCOMPARE(messageInput->text(), QString(""));
    
    int currentRowCount = requestTableModel->rowCount({});
    QCOMPARE(currentRowCount, initialRowCount+1);
    
    std::vector<std::string> requests = walletModel.wallet().getAddressReceiveRequests();
    QCOMPARE(requests.size(), size_t{1});
    RecentRequestEntry entry;
    DataStream{MakeUCharSpan(requests[0])} >> entry;
    QCOMPARE(entry.nVersion, int{1});
    QCOMPARE(entry.id, int64_t{1});
    QVERIFY(entry.date.isValid());
    QCOMPARE(entry.recipient.address, address);
    QCOMPARE(entry.recipient.label, QString{"TEST_LABEL_1"});
    QCOMPARE(entry.recipient.amount, CAmount{1});
    QCOMPARE(entry.recipient.message, QString{"TEST_MESSAGE_1"});
    QCOMPARE(entry.recipient.sPaymentRequest, std::string{});
    QCOMPARE(entry.recipient.authenticatedMerchant, QString{});
    
    QTableView* table = receiveCoinsDialog.findChild<QTableView*>("recentRequestsView");
    table->selectRow(currentRowCount-1);
    QPushButton* removeRequestButton = receiveCoinsDialog.findChild<QPushButton*>("removeRequestButton");
    removeRequestButton->click();
    QCOMPARE(requestTableModel->rowCount({}), currentRowCount-1);
    
    QCOMPARE(walletModel.wallet().getAddressReceiveRequests().size(), size_t{0});
}
} 
void WalletTests::walletTests()