I posted about this in the general discussion trying to figure out what it was. I think I’ve narrowed it down. Playing Amara using the Firestorm sniper, when Indiscriminate triggers and the bullet ricochets it looks as though it treats it as having the Storm legendary effect instead of Firestorm. So, I get electrical orbs appearing above secondary targets instead of fireballs rising up then falling. The orbs shoot a red laser (I assume fire damage, I haven’t been able to tell with all the numbers I usually see).
Edit: Tested changing my action skill element. If on fire it produces the Firestorm’s effect, if I switch back to electric it changes to the Storm effect.