[2021] If GMY steals the green shock buff from enemy droids in Ground War and still has it when you finish an encounter, he will still have that buff at the start of the next encounter.

I noticed this while autoing through the mythic tier. I was using this squad: JKL (lead), GMY, Hoda, JKR, JKA. The green shock buff didn't persist between encounters on other characters, nor did any other buffs persist on GMY.