I've found another thread on this topic but it's from April and doesn't have a single answer. It also includes a video. Link to the thread : https://community.amd.com/thread/198992?q=Hitman%20DX12%20bug
My hardware : i5 6500 stock, Sapphire R9 390 @ 1040/1500, 16 GB Ram, ASRock Z170 Extreme v4 Mobo.
This glitch occurs regardless of any other settings when DX12 is enabled when aiming at certain areas of the map (check the video for clarification). I'm using the latest Drivers (16.6.1) but this glitch also occured on previous driver versions.
Thanks in advance.