Today I was updating xali's Enhanced Vanilla and realize that in some case, overlays are z-fighting each other. This is a particular case since I have 3 overlays over one block. When looking with Optifine it was not happening at all. Over the big surface it only happen about 0.5% of the time over a large surface of 4 random blocks.

I'm using only Continuity 2.0.1+1.19. without Sodium and Indium.