I assume this is related to the changes where they add some transparency and glow to the tips of characters ears which is a neat touch for Elezen and lalafell.

I feel like something went wrong for the female raen however because now there's this hot pink along the edges/points of the horns. It isn't always super noticeable (less noticeable in combat, more noticeable when zoomed in for cutscene type shots) and at first I thought it was a reflection of the color of some flowers or clothes but no it's just... really pink! Especially for us Face 2 users but even on the others its a bit jarring if you don't otherwise use pinks/peaches on your character. It FEELS like a bug given it's not happening to male raen. But I don't know maybe this is just some new lore to deal with and if her little horns ever get scratched they'll be a fountain of blood.