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.

***

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.
int initialRowCount = requestTableModel->rowCount({});
    QPushButton* requestPaymentButton = receiveCoinsDialog.findChild<QPushButton*>("receiveButton");
    requestPaymentButton->click();
    QString address;
    for (QWidget* widget : QApplication::topLevelWidgets()) {
        if (widget->inherits("ReceiveRequestDialog")) {
            ReceiveRequestDialog* receiveRequestDialog = qobject_cast<ReceiveRequestDialog*>(widget);
            QCOMPARE(receiveRequestDialog->QObject::findChild<QLabel*>("payment_header")->text(), QString("Payment information"));
            QCOMPARE(receiveRequestDialog->QObject::findChild<QLabel*>("uri_tag")->text(), QString("URI:"));
            QString uri = receiveRequestDialog->QObject::findChild<QLabel*>("uri_content")->text();
            QCOMPARE(uri.count("bitcoin:"), 2);
            QCOMPARE(receiveRequestDialog->QObject::findChild<QLabel*>("address_tag")->text(), QString("Address:"));
            QVERIFY(address.isEmpty());
            address = receiveRequestDialog->QObject::findChild<QLabel*>("address_content")->text();
            QVERIFY(!address.isEmpty());
            QCOMPARE(uri.count("amount=0.00000001"), 2);
            QCOMPARE(receiveRequestDialog->QObject::findChild<QLabel*>("amount_tag")->text(), QString("Amount:"));
            QCOMPARE(receiveRequestDialog->QObject::findChild<QLabel*>("amount_content")->text(), QString::fromStdString("0.00000001 " + CURRENCY_UNIT));
            QCOMPARE(uri.count("label=TEST_LABEL_1"), 2);
            QCOMPARE(receiveRequestDialog->QObject::findChild<QLabel*>("label_tag")->text(), QString("Label:"));
            QCOMPARE(receiveRequestDialog->QObject::findChild<QLabel*>("label_content")->text(), QString("TEST_LABEL_1"));
            QCOMPARE(uri.count("message=TEST_MESSAGE_1"), 2);
            QCOMPARE(receiveRequestDialog->QObject::findChild<QLabel*>("message_tag")->text(), QString("Message:"));
            QCOMPARE(receiveRequestDialog->QObject::findChild<QLabel*>("message_content")->text(), QString("TEST_MESSAGE_1"));
        }
    }
    
    QPushButton* clearButton = receiveCoinsDialog.findChild<QPushButton*>("clearButton");
    clearButton->click();
    QCOMPARE(labelInput->text(), QString(""));