wizard hat of the brotherhood not in 'Use Talents' menu

[Achievement:BugFound]

I have obtained a wizard hat of the Brotherhood, which has the activatable talent Arcane Eye. However, unlike my other 4 activatable items, this does not appear in the 'use Talents' menu when I push the 'm' key. It is, however, already bound to a Hot Key.

[0player]

SOme items let you use a talent (on their own speed and cooldown), others grant you a talent (at its native speed and cooldown). This might be the difference here.