On my Elec/Elec defender, I have noticed that the chain powers (Rejuvenating Circuit, Energizing Circuit, Empowering Circuit, and Insulating Circuit) do not continue their chain if they jump to an unaffectable pet such as a teammate's Illusion Control pets or a Lore Radial support pet (including my own!) even though the chain should make many more jumps with the number of Static stacks I have.
With several unaffectable pets present, I'll often only hit my primary target (a player, thus: not me inadvertently prioritizing pets by the chain target priority logic) and then see a lot of "unaffected" pop up, even when the team is very tightly clustered (thus: not a range issue) and I have upwards of 15-20 stacks of static (thus: not a chain length issue), while several players are at low health/endurance (thus: Rejuv/Energizing/Insulating SHOULD be trying to hit them first, not unaffectable pets at full health/endurance)
I know unaffectable pets being unaffectable is WAI, but it's kinda weird to have, say, a call for lore pets suddenly make my heals and buffs much worse, especially when they're not my pets at all.
(It made healing the last fight in a 4* ITF... frenetic, shall we say, when we opted to summon lores.)