The complete log is here: https://gist.github.com/noobanidus/47c0e6881e8bc5c9f09f42655efd2bc2

I presume that, judging by the fact that it's attempting to load it with the VanillaLoader instead of the OBJLoader, it's something to do with that.

It's probably minor, but it's contributing to the amount of errors in my log and I'm trying to cut down by doing PRs, etc, so I can at least read the logs and datapack reloads. Unfortunately this isn't something I can easily do a PR for.

OBJ loading does work as of ... I think 28.1.95? However itemblock models have to be done custom. I had example code somewhere but I'm not sure where I've put it.

It's a known issue. Last I worked on it OBJ loading wasn't working

So uhhh yeah. I legit have no idea how to get the rendering working again in the current versions. If anyone knows please feel free to shout xD