[Gameplay] Skarner stun failing to go off on auto attack.

When E lands on an enemy, and if Skarner attacks immediately, the auto-attack will damage the enemy but the stun proc does not go off. Another auto-attack is required to achieve a stun.

To recreate: Stand beside an enemy, use E on enemy and immediate auto attack. Bug confirmed if enemy still has E proc after auto attack Chance of occurence: Roughly 30%, attack speed may affect not confirmed, auto-attack wind-up may affect bug not confirmed.