Yeah, it is extremely confusing. I scoured through that log (and others in other attempts) also, waiting a lot of time on the loading screen trying a bunch of different things to see if anything related to the mod patch would come up, but to no avail. I do notice I have many errors, but I believe much of it has to do with Optifine not jiving with certain things. I also use a shader, and I have not tried without that, so there’s potential maybe that’s causing the lack of texture. So very confusing. I’m at a loss here. It does the same on my laptop as well haha.
EDIT: Yes, I am looking at the correct chests, Iron Chests. Unfortunately, the texture does not load in JEI either. If it matters, I’ve been playing on Enigmatica 6 Expert. I don’t know if that modpack has some mod in there that may overwrite the texture for some reason.
[512x - 32x] Iron Chests [MC1.4 - 1.16, 1.18 - 1.19]
Alright, well, I am an idiot. I've been trying to figure out my issue for so long, I finally just decided to go in and edit the JAR file itself and see if I could import the textures into it. During my endeavors, I discovered my issue - when I merged the patch into PureBDCraft, it emptied the model/textures folder, so while the mod patch was loading, the textures did not exist as they were deleted!