DH + (BSL) shaders Black screen flickering

random black flickering. not sure if it happened in other versions too but rn its on 1.20.4.
multiple shaders produce the same issue (bliss, bsl)
it happens in world and game menus. sometimes its fully black, other times u can see large pixelated grids/dithers as a part of overall .
from my limited testing, it seems to only occur in fullscreen and borderless mode.

EDIT: it happens in windowed mode too, just much less.
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