OpenGL error spam in Iris 1.8.8 for 1.21.1

I'm pretty sure this wasn't the case for 1.7.5.
Shaders I tried are the lastest in-dev versions of Bliss, Photon and Photon GAMS, all having the same issue.
latest.log3.35MB
Solution
Issue narrowed down to Distant Horizons version 2.3.0-b. Try their nightly build and see if that issue been fixed.
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