shader fails to load completely; no chat message. 1.20.4

iris doesn't show the failed to load error, I had to open the console in the launcher to see the failed to load error. the shader pack also drags into the shader pack selection screen as a "valid shader pack".
the shader doesn't technically support 1.20.4, but I fail to see how there could be much difference between 1.20.1 and 1.20.4.
shader used: https://www.curseforge.com/minecraft/texture-packs/old-lighting-old-water
version: 1.20.4
mods used:
advancementinfo-1.20.4-fabric0.91.2-1.4.jar
badpackets-fabric-0.6.1.jar
beenfo-1.20.4-fabric0.91.2-1.3.4-spigot.jar
brainierbees-1.4.3.jar
cherishedworlds-fabric-8.0.1+1.20.4.jar
CraftPresence-2.3.9+1.20.4.jar
dcch-1.3.jar
deathlog-0.3.2+1.20.3.jar
dynamic-fps-3.4.3+minecraft-1.20.0-fabric.jar
emoji-type-2.2.3+1.20.4-fabric.jar
entity-outliner-1.2.6.jar
entityculling-fabric-1.6.4-mc1.20.4.jar
fabric-api-0.97.0+1.20.4.jar
fallingleaves-1.15.6+1.20.1.jar
ferritecore-6.0.3-fabric.jar
iris-1.7.2+mc1.20.4.jar
lazydfu-0.1.3.jar
libjf-3.14.3.jar
lithium-fabric-mc1.20.4-0.12.1.jar
modelfix-1.14-fabric.jar
modmenu-9.0.0.jar
morechathistory-1.3.0.jar
nbttooltip-1.8.1.jar
owo-lib-0.12.0+1.20.3.jar
RepeaterSound-1.4.0_1.19.3+.jar
replaymod-1.20.4-2.6.15.jar
slyde-1.7.3.jar
sodium-extra-0.5.4+mc1.20.4-build.116.jar
sodium-fabric-0.5.8+mc1.20.4.jar
sodium-shadowy-path-blocks-3.2.1.jar
StackDeobfuscatorFabric-1.4.3+08e71cc.jar
tooltipfix-1.1.1-1.20.jar
Void-Fog-2.11.1+1.20.2.jar
world-host-0.4.13+1.20.4-fabric.jar
worldedit-mod-7.3.0.jar

am I doing something wrong? please and thank you
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CurseForge
The original feel of Minecraft
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Solution
apologies for leaving you on read for so long, I decided to "do my own thing", so to speak
me looking at the log sent me down a rabbit hole of downloading colormatic for the colormap shaderpack (a really good idea, apparently!), among other mods listed here (like the skybox mod) https://optifine.alternatives.lambdaurora.dev/. this has made the pack work AND work better than it otherwise would've. beta lighting! hoo-ray!
only slight differences that I can't seem to fix are the skybox not really working, and the smooth lighting on the water while still retaining smooth lighting elsewhere, which there doesnt seem to be a mod to turn off specifically. oh well. if there's possible help with those two issues, I'd appreciate it. otherwise, I've solved the issue.
LambdAurora
A list of recommended OptiFine alternatives for Minecraft: Java Edition.
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