Hi,
On the pictures you can see that DoF setting is Off, but long-range objects are still blurry.
Tried turning a lot of other settings, and that blur is like static, nothing affects to that.
So, here are screenshots of a bug itself (is it a bug, idk, mb other settings), my setup and DoF settings window.

Versions:

• Minecraft: 1.20.5
• version of a shader: 8c5c26a commit
• Fabric + Iris 1.20.5

this is bloomy fog, not a bug. you can configure it in fog settings