It’s usually actually the lions which scavenge hyena kills, not the other way around.

It was, until recently, believed that Lions were the so called ‘king of the beasts’ and that they lauded over all but studies have found that in many areas Hyenas are dominant over Lions.

In many areas of Africa the Hyena hunts more food than it scavengers and Lions scavenge more than they hunt. Hyenas react very differently to male and female Lions.

https://www.botswana.co.za/Botswana_Wildlife_Behaviour-travel/the-predator-chain.html