Cast on Minion Death doesn't work with spectre self-destruct skills

Bug Report ID: #4236488511

Hi! I tried combo-ing cast on minion death with minions that die by using their own skills, such as the Zealous Excavator, and it simply doesn't give any energy. Is this by design, or is it a bug?

I know minion death triggers don't work with expired durations and weapon swaps, but it doesn't mention anything about self destructs.

I'm trying to find some answers on this too.

Infernal legion grants energy for ancestral channelers, but not bannerbearing zealots.

They're both spectres, they're both persistent minions, and they're both dying the same way, so what gives?