Shadow rendering error when used with OptiFine

[MKxingsheng]

Describe the bug

When only OptiFine and Alfheim Lighting Engine are installed, shadows beneath slabs and stairs exhibit serious issues. The problem is more noticeable when shaders are enabled.

redpandacompress_Minecraft.1122.2026-03-27.14-03-09.mp4

Reproducibility

• I reproduced this issue with as few other mods as possible installed.
• I am unable to reproduce this issue consistently.

Screenshots and/or videos

No response

Logs

https://mclo.gs/h2yubxj

Debug Logs

No response

Crash Reports

No response

Alfheim Version

1.6

Forge Version

1.12.2 - 14.23.5.2860

MixinBooter Version

10.7

Java Version

1.8

Java Virtual Machine

Hotspot

Operating System

window 11

GPU Vendor

NVIDIA

Code of Conduct

• I agree to follow this project's Code of Conduct