So I'm on upgrading my main modpack from NeoForge 1.21.1 to 1.21.4 and when reinstalling all the mods, I noticed that Polytone crashes Minecraft when combined with Sodium/Iris for shaders. I already tested any combination of Polytone, Iris and Sodium after having all of them on the newest version crashing my client as soon as I load into a world.
The main resourcepack of the modpack relies on Polytone so I can't update the modpack until I know how to fix this.