So this is a bug I learned about a couple days ago and related to one that I knew about in-dev.
Energize is weird. Something about how it's coded in the back-end has an odd set of bugs.
- Until you basic attack to consume Energize at some point in the game, Energize triggered by fake attacks will consume the charge but not do anything.
- New, related bug: After being ulted by Renata, a similar bug exists: Until you again trigger Energize with an auto-attack, your fake-attack Energize triggers retain the friendly fire flag.
So I want to fix this, of course, but it only ever exists on specific champions and only sometimes, and because the effect is mostly detrimental (Renata gets the gold), it's also fixed automatically by normal gameplay patterns.
But again, need to dig into underlying Energize tech to fix it. I'm 99% sure this bug exists in 13.9 and prior on Rapid Firecannon and Stormrazor on the same champions. The missing damage one certainly does.