Invoice for an order that contains only one configurable product is not generated correctly

[mizzimizzi]

Preconditions (*)

1. Magento ver. 2.3.5-p1
2. Magento 2.4-develop

Steps to reproduce (*)

1. create a cart with exactly one configurable product
2. complete the order with any payment method
3. invoice the order from Admin (only if the invoice has not already been created)

Expected result (*)

The invoice is treated as last invoice (\Magento\Sales\Model\Order\Invoice::isLast returns true)
e.g., invoice with simple product

Actual result (*)

The invoice is not treated as last invoice (\Magento\Sales\Model\Order\Invoice::isLast returns false)

---

similar issue is #22283
isLast should skip the dummy items to avoid the problem.

extra info: if the order contains extra fees (for example the costs of cash on delivery) taxes on these are not calculated in the total and the total due is greater than 0

[m2-assistant]

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[m2-assistant]

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[magento-engcom-team]

✅ Confirmed by @engcom-Delta
Thank you for verifying the issue. Based on the provided information internal tickets MC-39878 were created

Issue Available: @engcom-Delta, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[alexalisov]

I've tried to fix this issue in my module, using my custom method for checking last invoice. Seems like it is working fine

    /**
     * Checking if the invoice is last
     *
     * @param Invoice $invoice order invoice
     *
     * @return bool
     */
    public function invoiceIsLast(Invoice $invoice)
    {
        foreach ($invoice->getAllItems() as $item) {
            /** @var \Magento\Sales\Model\Order\Invoice\Item $item */
            if (!$item->isLast() && ($item->getOrderItem() !== null) && !$item->getOrderItem()->isDummy()) {
                return false;
            }
        }
        return true;
    }

But maybe need to look deeper into $invoice->getAllItems() and try to get rid of dummy item in this collection