Lifesteal can generally not heal off of allies and wards. For some reason, Insatiable Hunger can, as the only source of lifesteal.

1. Lose health as Broodmother
2. Cast Insatiable Hunger
3. Attack some wards or allies

Result: Insatiable Hunger's Lifesteal heals from wards and allies.

Expected: Like every other source of Lifesteal, Insatiable Hunger should not heal off of wards and allies.