The damage of a critical hit is the original attack damage x 1.5 + increased damage due to sharpness

1. Enchant the item with a sharpness enchantment.
2. Critical attack with it.

Observed result

The damage of a critical hit is the item's original attack damage x 1.5 + increased damage due to sharpness.

Expected result

The damage of a critical hit is (the item's original attack damage + increased damage due to sharpness) x 1.5.