Wizard Spirit bugged
This spirit dont allways cast his spell. You can see the animation but you dont see any efect from the cast. This is visible during combat with mobs. When you stand still in your realm the spirit cast the regen spell normaly ( with no summon bonus he is able to cast his spell 7 times). So its like the spirit has not mastered his spell or it is influanced with some king of letancy.
Thank you for reporting this, I will pass it along.