I also have glitches and video artifacts. Basically only in certain scenes, not accidentally.

Non only me have such a problem.
On the Steam forum, other players with the RX 560 graphics processor also note that they have this problem.

Motherboard: Gigabyte GA-AB350;
CPU: AMD Ryzen 5 1500X;
GPU: Gigabyte AMD RX560 Gaming OC 4G;
RAM: Corsair Vengeance RGB 2x8GB;
OS: Microsoft Windows 10 Pro v.1803 build 17134.228;
Video Driver: Radeon Adrenalin 18.8.1;
DirectX 12;