I tested it in normal map combat (Prologue, specifically) and it works fine. It’s the arena where it flickers in and out. (Keep in mind that it could be that it’s on a tile-by-tile basis because I could’ve swore it appeared at random intervals in normal combat too, but that could be the Mandela Effect)
It’s the same with another issue I have elsewhere regarding black spots when Ephraim and Eirika promote, and it’s really annoying and I’d like to fix both somehow without having to replace the FE3 Barbarian sprite…