[another] bug if you ask me.
Magic 6 to Magic 7 = 35 karma.
Magic 6 to Magic 5 back to magic 6 = 35 karma.
Magic 6 to Magic 3 (3 essence cost) to Magic 4 = 35 karma.
magic 6 and max magic 6
at step 4 you get exceptional attribute [magic]
= magic 6 and max magic 7
at step 6 you get 3 essence worth of augmentations
= 3 magic and max magic 4
at step 7 (or post-chargen) you spend karma to increase your magic rating by 1
= 4 magic and max magic 4 [this should cost you 20 karma and not 35 karma]