In all my years of playing I have never seen anyone seemingly lock into a ghost during a fight like this is it legit or is there some scripting going on here.
For an actual answer, that is a fallback texture to prevent a thing that is supposed to show a texture, show no texture. The image you’re seeing always exists in Unreal Engine (and always has, since the beginning), and will show up if something is missing or not downloaded or maybe somethin went wrong. No cause for alarm or worry