I don't know why this happens, I've tried everything. It happened the same to me when I was using Forge and OptiFine, and it's the main reason why I moved. I've tried to launch the game using both Iris and NeoForge installations (the only other mods I have installed are Sodium, Biomes O'Plenty and Xaero's Minimap), and there's no other way to get the game to work than eliminating Iris archive from the folder (I can't use shaders if it's only located in its own folder and not in the mods one). I'm lost, so if anyone can help me please tell me what the problem might be or what other software should I install.