When a combat-only Spell Alert is based on a stackable aura, the combat-only fade-out effect does not always happen.

It has been observed on Cataclysm with Mage's Arcane Potency:

• when Arcane Potency is triggered, the mage has 2 stacks 👉 quickly fade out after combat ✔️
• then, casting a damaging spell consumes a charge, the mage has 1 stack 👉 no quick fade out after combat ❌

Fixed in #289.