This is my crash report. I don't know exactly what happened, but I hope you figure it out.

crash-2025-03-10_15.15.06-client.txt

First thing, avoid using Optifine in modded environments, if you need to make fresh animations work you can use the Entity Model /Texture Features mods + sodium & co for performance. As optifine messes with stuff with closed source code, modders refuse to deal with it.

Second compatibility with IP is going to be delicate for most mods, unless there is something pretty wrong with our code it's usually on their side to keep things working.

Thank you, but I'm on Forge, and Optifine is my only option. Could the modders make an exception for the forge version?

We can't really add compat specifically for IP, they will need to add it. IP has worked with this mod for years, so this is a regression on their end.

On forge you can use Embeddium and Oculus for shaders as an optifine replacement.