Crashed game (1.20.1 Forge)

<img width="609" height="443" alt="Image" src="https://github.com/user-attachments/assets/b71e7d95-027f-4a6a-8e89-2777f1b5f186" />

I built a roof of slabs, i added this mod loaded in, went and placed the slab on the bottom half of a deepslate tile slab.