Visual Bug: Lines on Screen in darker areas and with MXTs

Ever since the new Abyss League I've had the following visual bug:

When in certain areas (especially darker ones) where light is generated by only a few objects or where the light source comes from above, lines start appearing on screen and some other objects dissapear (mostly walls and doors)







Notice in the following 2 pictures that I only moved my character a small distance from the entrence of the area.



no lines on screen and the walls are there.



walls have dissapeared (or are flickering in and out of existence) and the lines are all over the screen.

these are only some examples of the Solaris Temple lvl 1 in act 8
I've noticed this happening throughout the game in several areas where the lighting of the area is dimmer than normal and it's highly annoying to play the game with a screen full of lines like this.


On a related note I've seen the same lines appearing on screen when someone used one of the new Microtransations in game, but those only seem to have one or two lines on screen at most.
Notice the faint line pointing towards the the character with the conflicting MXT








I'm running the game on Windows 7 (x64)
Intel i7-7700K 4.2GHz
16GB RAM
Nvidia GeForce 750 GTX Ti

I have all graphics on High (MSAAx8, 8x Anisotropic Filtering)

I've tried using low specs and even reverting to Dx9 and Dx9Ex but the lines are still there as shown in the pictures.

Please help me understand where this is coming from and if it is something I can fix myself or if it is something that needs a bugfix.