[Gameplay] Ezreal & Runeglaive interactions + lifesteal/spellvamp

With the recent 5.13 patch that changed runeglaive to no longer proc spell on hit effects for Ezreal, Ezreal is unable to trigger lifesteal or spell vamp with his auto attack or q, while charged with the runeglaive passive.

I am unsure if this is a bug, but I think it would make sense to be able to either lifesteal physical damage or spell vamp spell damage.

I tested this is a custom using Bilgewater cutlass for the lifesteal, and upgraded to hextech gunblade to test for spellvamp since the lifesteal had been ruled out as interacting with runeglaive empowered mystic shot.