[Issue]: Shadows disappeared when camera is at a low angle

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Description

https://github.com/user-attachments/assets/cd6fcb65-7e03-44d9-ac21-634fcca7c037
A video describing the issue. Low quality because I have problem uploading large files...

When using a lot of shader packs containing shadows, if the camera goes down to a low angle then the shadows gradually disappeared from near to far, but if the camera is kept up then the shadows looks normal.

Mods (also shown in the video):
UniMixins 0.1.23
FalsePatternLib 1.10.5
FalseTweaks 4.3.2 (tested without FalseTweaks and the issue still happens)
SwanSong 1.2.6

The glitch does not happen with SwanSong 1.2.5.

System info
OS: WIndows 11 25H2 x64
CPU: Intel Core i7-14650HX
GPU: NVIDIA GeForce RTX 5060 Laptop GPU
Driver version: 581.80

fml_client_latest.log, and crash reports, if any.

fml-client-latest.log

I have submitted the required files

• I confirm that i have attached the required log files as a github attachment, and not as a pastebin/mclogs link.