To reapply the effect on Steve was complicated, you must stay away from the player and position your camera in a specific position for this to happen.
It also happens to players. I believe the game's FOV code is wrong. She is applying the white effect to mobs and players.
Has the Herobrine Secret been revealed?
More Details:
I'm using 1.16.2 vanilla (without optifine)
It seems to occur in all entities that have a black pixel next to a white pixel. (I believe it is a problem when cutting the texture when the player is too far away, or a problem with FOV.)
Or maybe it may be a problem in OpenGL when the texture is unloaded from memory. 🤔