Cleave cant crit.
The axe bonus from the Heavy Weapons bonus is scaling off of spell crit instead of weapon crit.
Easily testable and tested, I have 50% crit chance on my character, I've yet to see Cleave crit once since 1.4.
The axe bleed from Heavy Weapons on the other hand was also easily testable by the toggling on and off of magelight and testing over 50-100 hits. Using magelight was netting ~20% more crits when I did this.
Would like to see some fixes here.