Can't use Iris Shaders in Curseforge

For some reason I can't use Iris in my Curseforge modpack. I've been able to previously with older versions like for example 1.20.1 or 1.20. But now when it comes to 1.20.2 it does not work. The mod pack is 1.20.2 and is set to Fabric. I have Sodium 1.20.2 Fabric in the mod folder too along with Iris Shaders 1.20.2 Fabric. Why does this happen? I can't find a way around it even tho the versions and everything match up.
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