Hi this is Kana Minami's player. At level 8 you get + 2 charisma for the perk Mesmerizer. When resting you gain bonus spells but upon rest completion you lose the bonus spells. I was thinking this was a bug as the class perk doesn't mention that bonus spells aren't going to be given as well.
While on this topic, mass charm from the perk seems a bit buggy too.. It affects the caster and once affected you lose all of your first circles spell even if you had max usage of all of them. While losing spells seems weird.. the problem of it affecting the caster for a good 30 seconds plus makes it non viable to use as it's more a liability then an aid, since you must get so close t o an enemy to use it.