1.12.2 is the only version that optifine is broken in for me. Optifine_1.12.2_HD_U_F5, Sildurs Vibrant Shaders v.1.22 Lite. I have tried this with every shader pack and each one is affected by
Lagless Shaders | Shaders Mods
KUDA Shaders Mod (1.19.3, 1.18.2) - New Lightning System - 9Minecraft.Net
Minecraft 1.12.2 Shaders bug/ Light between stone blocks. : r/Minecraft
Sildurs Shaders
SFLP Shaders (1.19.3, 1.18.2) - Shaders for Low End PC's - 9Minecraft.Net
Shaders for Minecraft 1.12.2
BEST High FPS / Low-End Shaders 2017 | Minecraft 1.12.2 - YouTube
The KUDA Shaders mod is one of the most popular shader packs of all time for Minecraft 1.12 and 1.11.2. This is because it's … | Minecraft, Shader pack, Minecraft 1
DocteurDread's Shaders for Minecraft 1.12.2/1.11.2 | Shaders Mods