I am now myself in search of a solution to this problem, it is exactly the problem. white edge can appear under different conditions, it looks like a stroke, I have written a couple of times to the forum on this problem, no one has been able to give an answer, I think there is some console command that can fix this problem, the problem appeared in 5.3 or 5.2 version, before that there was no such thing, the developers are constantly breaking something in the engine(