On Fabric 1.21.4, changing crosshair blending/custom color settings apply only to the crosshair itself and not to the attack indicator. This causes a visual disparity in what are both elements of the crosshair.

Aiming at the sky, my crosshair stays solid white while my attack indicator turns dark. I'm not sure if this is a bug or intended behavior, but if it's the latter it would be cool to get a config option to disable blending on the attack indicator as well.