- Image of the broken texture in game

I also have the same problem and I figured it out that is optifine ,but IDK what setting it is that is bugging the helmet texture did you figure out what that setting is ?

Did you happen to install any other mods that may affect rendering visuals? And what modloader version are you using?

My visual mods are the first person mod, optifine and better animations. It might be because of an optifine setting tho