EC forgets last target when it is a fire ant.
I've noticed at least with the EC that it forgets the last target when the target is a fire ant. I've targeted the ant by clicking on it, targeting the health bar, and targeted the enhanced targeting bar but after a few casts of chained lightning against last target the ant is no longer the last target and my next cast of chained lightning fails with target out of range or target not seen even though the ant is within a few tiles of me, or it just thunders because there is no target for it hit.