You litterally can't see anything with the darkness effect when an area is already dark, I tested this at night on the surface but the result is litterally worse in a ancient city or a deep dark biome since there is normally always light lvl 0. Unless you place some torches in a cave but these hardly change anything. The colors get even weirder if you have night vision. Then the beating of the darkness Effect gets a blue color if combined with night vision as seen in the night vision Video. At the current point You are forced to use the night vision potion because if you are not using it, you can't see anything. I even checked the visual settings but unlike Java there is no option to config the strenght or intensity of the darkness effect. I might have missed a setting, but I am littrally Blind when I have this new effect.