Found bug #367

I have similar underground streaking artifacts on Minecraft 26.3.

Environment:

• Fabric Loader 0.19.5
• Complementary Unbound / Reimagined r5.9.3
• Distant Horizons 3.3.2
• Iris 1.11.6
• Sodium 0.9.2
• RTX 3060 Ti, Windows 11, NVIDIA driver 616.56

Disabling shaders or DH rendering removes the artifacts.
Both Complementary variants have the issue.
Changing render distances and removing Veinminer Client did not help.
Switching to BSL resolved the visible issue in my test.

The underlying cause is unconfirmed.