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.
{
    QList<SendCoinsRecipient> recipients;
    bool valid = true;
    for(int i = 0; i < ui->entries->count(); ++i)
    {
        SendCoinsEntry *entry = qobject_cast<SendCoinsEntry*>(ui->entries->itemAt(i)->widget());
        if(entry)
        {
            if(entry->validate(model->node()))
            {
                recipients.append(entry->getValue());
            }
            else if (valid)
            {
                ui->scrollArea->ensureWidgetVisible(entry);
                valid = false;
            }
        }
    }
    if(!valid || recipients.isEmpty())
    {
        return false;
    }
    fNewRecipientAllowed = false;
    WalletModel::UnlockContext ctx(model->requestUnlock());
    if(!ctx.isValid())
    {
        
        fNewRecipientAllowed = true;
        return false;