I think its just the lowlight area shadow hack to prevent leakages being triggered on and off because of the lightlevels.
I tried downloading the driver from Intel's website but it gave me an error. "the driver being installed is not validated for this computer"
My laptop is a ASUS ZenBook Flip 14 UX461UA, so I tried downloading drivers from ASUS' website but that also did not work. Here is the link that I used from ASUS' website: https://www.asus.com/2-in-1-PCs/ASUS-ZenBook-Flip-14-UX461UA/HelpDesk_Download/
The driver I've linked you is the correct one, but your gpu might has a different/custom device ID so you need to force flash it once and run the setup afterwards. After that you will be able to update it with just the setup again, for future updates.
Intels website has two options .exe and .zip, download the zip file and unpack it.
Open your device manager - rightclick your gpu device - update driver - on this pc - pick from list - harddrive/harddisk and pick iigd_dch.inf inside the graphics folder (from the intel zip file package). After that run the intel setup again.
Might be a mod issue, check if it happens with just optifine.