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.
{
    secDelay--;
    updateButtons();
    if(secDelay <= 0)
    {
        countDownTimer.stop();
    }
}
void SendConfirmationDialog::updateButtons()
{
    if(secDelay > 0)
    {
        yesButton->setEnabled(false);
        yesButton->setText(confirmButtonText + (m_enable_send ? (" (" + QString::number(secDelay) + ")") : QString("")));
        if (m_psbt_button) {
            m_psbt_button->setEnabled(false);
            m_psbt_button->setText(m_psbt_button_text + " (" + QString::number(secDelay) + ")");
        }
    }
    else
    {
        yesButton->setEnabled(m_enable_send);
        yesButton->setText(confirmButtonText);
        if (m_psbt_button) {
            m_psbt_button->setEnabled(true);
            m_psbt_button->setText(m_psbt_button_text);
        }
    }
}