Custom models refuse to load on LAN servers, and it's in several odd ways. Sometimes, they load fine, sometimes they require a death to work, and sometimes they'll work only for the person hosting the LAN server and nobody else. This does not occur at all on dedicated servers, however if somebody hosts one on the same PC that they're playing on, they will no longer be able to see their own model, however everything else works perfectly.

I'm sorry that this is a bit of a messy bug report, I haven't submitted one for anything in a while and I didn't see any format already used here before. If I need to provide logs or recordings to help figure out what's happening please let me know and I'll gladly do so.

What version of minecraft are you using? Are you using the latest CPM Release? Check the Error Log under the Gesture Menu (G) / Social Settings/Error Log, if there is an issue with model loading it should show up there. Please post both of your logs (after this issue happens).

We were using 1.18.2, latest CPM release, and unfortunately I did not grab the logs from that exact menu at the time of it happening. Are they still stored somewhere I can get them now or will I have to try and replicate the issue and get a new log?

Post your minecraft log, it may have some info, but you have to replicate the issue to see it in the Error Log menu.

Here's the log from the session it had happened in. I'll work on replicating the issue with a friend as soon as I can.
2022-08-11-2.log

Try the latest version (0.4.8a) model loading had issues on 1.17+