Hard to describe so please watch the mp4 and png file I attached. But basically like the title said : far hide is kinda buggy ?
Or maybe it was intended to work like that ? But people are sometime glowing while prone. The mp4 and png file come from two different player at different time (so that means its a global thing not only one player).

I recommand this video for new ideas on how to implement Far Hide.
https://www.youtube.com/watch?v=YTxtAWJsUvQ