Checkout twig variables vary between different stages

[thomasjthomasj]

Bug description

Not strictly speaking a bug but so stupid it may as well be a bug, to get the base price of an order item on the first and third stage of checkout, you need call item.item.basePrice, where on the last stage, you need to call item.sum('basePrice')

The reason for this is that at the first and third stage, item is an array of data, where on the last stage, it's an instance of Order\Entity\Item\Row

How can this be replicated?

Related Issues / Trello Card / Code?

Anything else to add? (Screenshots, background context, etc)