Seems that there are certain values that the game will pick for you and depending how close you are on the slider to that value it'll set it to a higher or lower "pre-sets", bit odd.
Also I'm having serious framerate issues. Some parts of the game are running are 110 FPS and others are running at 29FPS. Most of the game jumps around from 55 - 80FPS. Also there are segments like at the garage when you collect the fuel cannister that sometimes it'll have a stutter and drop to 15 - 20FPS and won't go back up, saving the game somehow stops it, very odd.
Great game but the optimisation of the graphics is a big issue. I'm also noticing strange light flashing artefacts when looking at the light sources or looking at the console when running the game in DLSS balanced or performance. Goes away when put into quality but the game runs really terribly. I'm using a 2060 RTX card with an i5 9600k and 16GB of RAM so I wouldn't think this would be an issue given the stated recommended specs.
Also when you get to the towers with the orange lights if the shadows aren't set to 1 the lights look blurry, have lines in them and looks as if they are made of squares. Wouldn't be so bad if you could adjust the slider but it's either 0, 0.5 or 1. The game won't let you set shadows or any other graphics setting to anything else other than it's predetermined pre-sets. Well it will but as soon as you leave the menu and go back into it, it's been set to its closest value pre-set as mentioned above in my first paragraph.