Describe the bug

Describe the bug in as much detail as possible. capturing footage of it with images or videos is preferred.

No colored lighting is appearing, its all just the same color
Fog isnt being lit up. The end fog should light up, I have tried similar things with clouds and I cannot see the effect

Describe how your minecraft is set up

1. Include a screenshot of the in-game f3 debug overlay. Please make sure it is fully visible.
   

2. If you cannot do option 1. Please list the following information instead:

• What GPU vendor you are using Intel Arc A770
• What operating system you are using Linux, Bazzite GNOME Stable
• What minecraft version you are playing 1.21.1
• If you are using a special client for minecraft Fabric, Modrinth
• What shader loading mod you are using Iris
• What version of the shader you are using Bliss Shader Main
• If you are using any, what additional mods you are using besides the ones required to use the shader Just Sodium and Iris

Describe how to reproduce the bug

Show exactly how to make the bug appear, if you can. Video footage is preferred.

https://github.com/user-attachments/assets/363e8ab9-8bab-4aaf-85a6-05e16a2ee263
Note: Thats not fog light propogation its just bloom
No colored lighting is appearing either so there is no floodfill happening

Isolate the bug. some multiplayer servers cause issues on their own. in a newly made singleplayer world, with default/reset shader settings, show the steps to cause the bug

1. Find fog (set insane fog settings, go into clouds with render clouds as fog, go to end etc)
2. Place light blocks
3. Doesn't work?

if it is happening on content from a mod, list what mod, and what content of that mod it happens on. None

if a specific shader setting can make it start/stop bugging, please list what shader setting does that. None of the related settings make it start working

Hand held lighting is also not working, this may be related?

could you please describe the issue?
what effect are you expecting to happen?

you skipped the description part at the very beginning of the template. your issue reproduction instructions have nothing to do with the title of your issue, and the video shows nothing useful.

Updated the main post, mostly im not seeing any colored lighting nor lit fog propogating, I tried clouds and intense fog and end fog but it seems that no floodfill is occurring at all. I have checked the setting in Iris shaders and tried with and without several optimization mods.
Edit: oh i see the video mustve gotten corrupted I will update it later today

just to be sure... have you enabled floodfill? it is off by default. it is located in shader settings -> ambient light -> floodfill

I updated the post with the new video, yes I have checked floodfill is on and so is light propogation.

hm ill have to look more into this