Bug/Issue Fullscreen Flickering

It's been two years since I submitted my original bug report about this matter and this issue hasn't been addressed yet.

In-game, when switching to Fullscreen/Borderless Window mode, the lower half of the screen flashes randomly.
Whatever objects or textures are present in the screen are irrelevant to the flickering rate. Whether the game is modded or not has no effect on this issue.

My OS is Windows 10 Pro, Ver. 1706 Build 16299.248.

I've already tried messing with V-sync settings, and this caused even more problems (monsters moving in slow-mo, sound issues, etc.). Please help.