[GAMEPLAY] Face of the Mountain Shields Not Targeting Most Wounded Ally

In the description of the Face of the Mountain support item, there is the following description:

NEW EFFECT: Active shields 2 champions: you and target allied champion. Automatically targets the most wounded ally if cast upon self.

I have my hotkey 4 bound to Self + Quick Cast. However, when I use the Face of the Mountain active, it seems to target a random nearby ally to give the shield, and not the most wounded ally in range. This has happened several times over the past patches.