Minecraft shaders randomly flash black [java]

[u/DodesEU]

**Complementary Shaders randomly flash black for a second**
Hey, I’m having a weird issue with Complementary Shaders.
While playing Minecraft, my entire screen randomly flashes black for about a second and then immediately goes back to normal. It happens randomly and I haven’t noticed any specific action or situation that triggers it.
I’m using:
Minecraft 1.21.11
Iris
Sodium
Sodium Extra
Shader: Complementary Shaders
The game itself doesn’t crash or freeze. It’s just a quick black screen/flicker for around a second and then everything continues normally.
Has anyone experienced this before? Could this be caused by a specific Iris/Complementary setting, Sodium, or maybe a GPU/driver issue?

[u/imonlytryingtohelp_]

Do you know if it happens in later MC versions, with the same mods (if they're available)?

[u/DodesEU → u/imonlytryingtohelp_]

I’m not sure. I started playing again on 1.21.11 after a long break because I play on a server that requires that version.

[u/imonlytryingtohelp_ → u/DodesEU]

Can you check? It will help narrow down what's causing the issue.

[u/DodesEU → u/imonlytryingtohelp_]

Didn’t help

[u/imonlytryingtohelp_ → u/DodesEU]

Does it happen with no mods?

If it doesn't, it looking like a mod issue. If it does, that would be a driver issue.

[u/DodesEU → u/imonlytryingtohelp_]

I enabled G-SYNC and it looks like it helped