Iris disables Distant Horizons fog

In 1.21.4 with shaders disabled, the DH fog doesn't show, even when trying to enable the fog manually in the DH settings. Ive removed Iris mod and I can re-enable the fog easily. I'm not sure this is a DH issue or a Iris Issue but I just report I here first because its the mod that causes the issue. I also provided screenshots of what it looks like just in case. DH Version is the latest nightly release.