Update Invoice with New Line Item Preapends Instead of Appends

[hello-woof]

Hey all, I've been trying to add a new line item to the bottom of an existing invoice, but every time I update the invoice it instead prepends it to the top. Is there something else deciding the ordering of the line items?

Expectations: The order in which invoice line items appear should be based on the order of the list:
Actual: All new line items are prepended to the line_items list
Version: xero-python:1.23.0

def update_invoice(invoice: Invoice, xero_tenant_id: str):
  accounting_api = AccountingApi(api_client)
  new_line = LineItem(
      description=f"Hello world!"
  )
  invoice.line_items.append(new_line)
  print(invoice.line_items)
  invoices = Invoices(invoices=[invoice])
  response = accounting_api.update_invoice(xero_tenant_id, invoice.invoice_id, invoices)
  print(response.invoices[0].line_items)

I tried just rebuilding the entire invoice and flipping the order or the line_items, but it puts the "newest" item I want at the bottom instead at the top:

def update_invoice(invoice: Invoice, xero_tenant_id: str):
  accounting_api = AccountingApi(api_client)
  new_line = LineItem(
      description=f"Hello world!"
  )
  line_items = [new_line ]
  for item in invoice.line_items[::-1]:
      item.line_item_id = None
      line_items.append(item)

  invoice.line_items = line_items
  print(invoice.line_items)
  invoices = Invoices(invoices=[invoice])
  response = accounting_api.update_invoice(xero_tenant_id, invoice.invoice_id, invoices)
  print(response.invoices[0].line_items)

[hello-woof]

For others having this issue, I found removing the line ID kept the order correct

# This allows the order of line items to be respected
        line_item: LineItem
        for line_item in self.data.line_items:
            line_item.line_item_id = ""