Issue also occurs from the original V9 version, if that might help.
https://www.curseforge.com/minecraft/mc-mods/chunks-fade-in
kerudion/chunksfadein#54

I've not had this type of issue from other shaders (complementary, seus), so it's definitely fixable. I'm just unsure what in V9 causes the problem.

Here is a video showing the issue (this was 201ee55)

this should happen on other deferred rendered shaders (photon, kappa, nostalgia, noble)
i do not know how to resolve such an issue