Mordekaiser's Ult

New Mordekaiser's ult currently will go on cooldown but not activate if;

-The target goes in to the fog of war as you're casting it -The target uses zhonyas or becomes otherwise untargetable while casting it -The target enters stealth, which doesn't interrupt other targeted abilities normally (annie Q, fiddle W, etc)

I think this should be addressed. Abilities going on full cooldown but not even remotely activating seems like a serious issue, especially for Mordekaiser's game-changing ultimate. Considering how long of a cooldown it is even at 40% (1 minute, which is ages in League time), it's extra harmful to Morde- Both when he's using it to get out of a nasty situation, and when he's using it to force one on the enemy.