[Gameplay] Electrocute & Lux Passive

I have a question about Lux's interaction with the Electrocute rune. Does her passive not count as an ability? I only ask because you can proc Thunderlord's Decree with an ability + aa + passive as it registers Lux's passive as a separate ability. Why is that not the case with Electrocute? I need to use two abilities + aa (or 2 aa + ability, etc), her passive doesn't count. I'm just wondering if this is intentional or not? If it is, what is the rationale behind this? Thanks!
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