On cart.confirmed when iterating through items array, all the amount fields are with tax - even the totalPriceWithoutTaxes.
Also, in V2 there was a field unitPriceWithoutTax, is there an equivalent in V3?
This is a scenario where taxes are included in the price, and everything is set up correctly (data-item-has-taxes-included="true" and Included in price option in the tax rate definition).