I'm not sure if this was a change in CC, but some air moves have been given 2 proration values dependent on if you are landing them ascending or descending. Some examples:
Cciel's j.c has 90% descending, 50% ascending
Nero's j.b has 90% descending, 50% ascending
Farc's j.a has 75% descending, 40% ascending
These changes only take affect if you are landing the attack on a grounded opponent, so it does not affect normal air combos at all. This is basically just a nerf to fuzzy guard damage, although some moves you can fuzzy guard with are not affected by this nerf such as Kohaku's j.c, Hime's j.a, and cwlen's j.b.