I seem to have a bug on my v16 Sorcerer. Trying to level my Restoring Twilight, the tooltip says I am supposed to get a 10% Magicka Regen buff. This buff shows up in my UI, but does not change my Magicka Regen on my stat sheet.
Here is with no Twilight:
Here is with:
I thought it might be conflicting with the passive regen from Vampirism, however that is not the case (and wouldn't make sense anyway).
Here is with a Vampire ability slotted, NO Twilight:
Here is with a Vampire ability slotted AND Twilight (oh the humanity!):
As you can see, having a Vampire ability slotted DOES buff my Magicka Regen, but having Restoring Twilight out does not, with or without a Vampire ability slotted.