What to do when Magento 2.3.1 created invoices miss items?

This could happen when bundled products and simple products are mixed in the order.

To solve this, override the Invoiceservice.php from vendor/magento/module-sales/Model/Service/InvoiceService.php and change the below functions codes.

public function prepareInvoice(Order $order, array $qtys = [])
{
    $isQtysEmpty = empty($qtys);
    $invoice = $this->orderConverter->toInvoice($order);
    $totalQty = 0;
    $qtys = $this->prepareItemsQty($order, $qtys);
    foreach ($order->getAllItems() as $orderItem) {
        if (!$this->_canInvoiceItem($orderItem, $qtys)) {
            continue;
        }
        if (isset($qtys[$orderItem->getId()])) {
            $qty = (double) $qtys[$orderItem->getId()];
        } elseif ($orderItem->isDummy()) {
            $qty = $orderItem->getQtyOrdered() ? $orderItem->getQtyOrdered() : 1;
        } elseif ($isQtysEmpty) {
            $qty = $orderItem->getQtyToInvoice();
        } else {
            $qty = 0;
        }
        $item = $this->orderConverter->itemToInvoiceItem($orderItem);
        $this->setInvoiceItemQuantity($item, $qty);
        $invoice->addItem($item);
        $totalQty += $qty;
    }
    $invoice->setTotalQty($totalQty);
    $invoice->collectTotals();
    $order->getInvoiceCollection()->addItem($invoice);
    return $invoice;
}

public function prepareInvoice(Order $order, array $qtys = [])

{

$isQtysEmpty = empty($qtys);

$invoice = $this->orderConverter->toInvoice($order);

$totalQty = 0;

$qtys = $this->prepareItemsQty($order, $qtys);

foreach ($order->getAllItems() as $orderItem) {

if (!$this->_canInvoiceItem($orderItem, $qtys)) {

continue;

}

if (isset($qtys[$orderItem->getId()])) {

$qty = (double) $qtys[$orderItem->getId()];

} elseif ($orderItem->isDummy()) {

$qty = $orderItem->getQtyOrdered() ? $orderItem->getQtyOrdered() : 1;

} elseif ($isQtysEmpty) {

$qty = $orderItem->getQtyToInvoice();

} else {

$qty = 0;

}

$item = $this->orderConverter->itemToInvoiceItem($orderItem);

$this->setInvoiceItemQuantity($item, $qty);

$invoice->addItem($item);

$totalQty += $qty;

}

$invoice->setTotalQty($totalQty);

$invoice->collectTotals();

$order->getInvoiceCollection()->addItem($invoice);

return $invoice;

}

private function prepareItemsQty(Order $order, array $qtys = [])
{
    foreach ($order->getAllItems() as $orderItem) {
        if (isset($qtys[$orderItem->getId()])) {
            if ($orderItem->isDummy() && $orderItem->getHasChildren()) {
                $qtys = $this->prepareItemQty($orderItem, $qtys);
            }
        } else {
            if (isset($qtys[$orderItem->getParentItemId()])) {
                $qtys[$orderItem->getId()] = $qtys[$orderItem->getParentItemId()];
            }
        }
    }
    return $qtys;
}

private function prepareItemsQty(Order $order, array $qtys = [])

{

foreach ($order->getAllItems() as $orderItem) {

if (isset($qtys[$orderItem->getId()])) {

if ($orderItem->isDummy() && $orderItem->getHasChildren()) {

$qtys = $this->prepareItemQty($orderItem, $qtys);

}

} else {

if (isset($qtys[$orderItem->getParentItemId()])) {

$qtys[$orderItem->getId()] = $qtys[$orderItem->getParentItemId()];

}

return $qtys;

}

private function prepareItemQty(\Magento\Sales\Api\Data\OrderItemInterface $orderItem, &$qtys)
{
    /** @var OrderItemInterface $childOrderItem */
    foreach ($orderItem->getChildrenItems() as $childOrderItem) {
        if (!isset($qtys[$childOrderItem->getItemId()])) {
            $productOptions = $childOrderItem->getProductOptions();
            if (isset($productOptions['bundle_selection_attributes'])) {
                $bundleSelectionAttributes = $this->serializer
                    ->unserialize($productOptions['bundle_selection_attributes']);
                $qtys[$childOrderItem->getItemId()] =
                    $bundleSelectionAttributes['qty'] * $qtys[$orderItem->getItemId()];
            }
        }
    }
    return $qtys;
}

private function prepareItemQty(\Magento\Sales\Api\Data\OrderItemInterface $orderItem, &$qtys)

{

/** @var OrderItemInterface $childOrderItem */

foreach ($orderItem->getChildrenItems() as $childOrderItem) {

if (!isset($qtys[$childOrderItem->getItemId()])) {

$productOptions = $childOrderItem->getProductOptions();

if (isset($productOptions['bundle_selection_attributes'])) {

$bundleSelectionAttributes = $this->serializer

->unserialize($productOptions['bundle_selection_attributes']);

$qtys[$childOrderItem->getItemId()] =

$bundleSelectionAttributes['qty'] * $qtys[$orderItem->getItemId()];

}

return $qtys;

}

Once the changes will go live, the customer will have a complete invoice. None items will be missed.

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