If you target an enemy with Overload with Inverted simple ground targeting turned on it will interrupt itself if the originating target dies. If cast via ground target (no enemy targeted by reticle) it will complete the full 3 second channel properly.
Please allow Overload to cast completely when targeting an enemy, elsewise inverted targeting is a useless feature. Just because the single target of a massive elite AOE ability dies does not mean everything around it is also dead.