I'm getting some crazy dithering effects on the landscape. I first noticed the issue in the benchmark. When I just started the game, it was fine, while I was still in the tomb. But when I got outside, here's what I got. In some frames it simply looks as if I'm running on 480p or something.
Graphics settings are on ultra, 1900x1200. Cpu i5-6600K, gpu RX5700XT, neither maxed out. What is going on here, and how do I fix it?
https://imgur.com/a/rShrazN

