Flood fill causes painting to be dark

[IMoist]

I just placed a painting and it is so dark. If i dont hold a lightning source in my hand or go close to the painting i cant see it

-Nvidia GTX 1660 Ti Mini
-Windows 10
-1.21
-ATLauncher
-Iris
-Latest In-Dev Distant horizons support Bliss (Im not sure if its the latest one still)
-Uhhh do i have to? Its gonna take a long time.. ;
1 Architectury 13.0.6
2 Better Third Person Fabric 1.9.0
3 c2me fabric 0.2.0+ alpha.11.106
4 carry on 2.2.1
5 Client Sort 0.8.0
6 Cloth config 15.0.130
7 entity model features 2.2
8 entity texture features 6.2
9 fabric language kotlin 1.12.0+ kotlin2.0.10
10 ferrite core 7.0.0
11 freecam 1.3.0
12 Items Displayed v1.2.2
13 Jade 15.1.5
14 lithium 0.13.0
15 maliLib 0.21.0
16 modmenu 11.0.1
17 Not Enough Recipe Book 0.4.1
18 OctoLib 0.4.2
19 optiGui 2.3.0 beta.2+
20 placeholder api 2.4.0+
21 Roughly Enough Items 16.0.754
22 Shulkerbox Tool tip 5.0.4+
23 silk all 1.10.7
24 tweakeroo 0.21.50
25 Veinminer 2.1.3
26 wakes 0.2.5+
27 WI zoom 1.5
28 Worldedit 7.3.4
29 Xaeros minimap 24.2.1
30 Xaeros worldmap 1.38.8

Idk i just placed the painting and randomly saw its dark, i dont what could effect it, maybe clouds or chunk stuff because i made exact same thing at somewhere different and it was okay.
Here is the video footage: https://streamable.com/czymzx

It was singleplayer + Just watch the clip

Flood fill causes the bug:
https://streamable.com/mktx6w

Bliss-Shader-main.zip
Bliss-Shader-main.txt