broken internal fallbacks for gbuffer programs
I asked what was wrong with my shader and they told me
Iris appears to have missing or broken internal fallbacks for gbuffer programs, and your pack doesn't implement anything but the final program. So, to fix this, you need to add e.g. gbuffers_basic, which will be used as a fallback for all other programs. Alternatively, you can report this as a bug to the Iris developer(s) as this is an incompatibility caused by Iris - not sure if they'll fix it though.
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