Description:
When using RenderScale in combination with Distant Horizons and Iris shaders, the Distant Horizons LODs will show up in front of everything else on the screen
Reproduce
Install RenderScale, Distant Horizons and Iris. Enable a shader (Photon in my case) and put the Render Scale to something below 1.0.
This happens on every computer I own, ranging from an M4 MacBook Air to my PC with an RX 7800 XT or an RX 6600 on Linux, macOS and Windows.