Went to the nether, and immediately decided to return. While in the portal, I saw a crash. Never did re-materialize in the overworld.

After that it crashes while loading the world, so I can't even get back in. I'm playing the direwolf20 1.12 pack v1.1.0 in SP with server and client on the same machine.

Minecraft: 1.12.2
Forge 14.23.0.25231
AE2: appliedenergistics2-rv5-stable-2

crash log:
https://pastebin.com/mm9j4p3k

I rolled back to an earlier save (before setting up ME controller for the first time) and everything was fine - I was able to travel to different dimensions. Then, after I setup ME controller and connected it to everything, I went to the mining world. When I returned, the same crash happened. I saved right before going to the mining world, so I can reproduce the issue for you if you like.

The new crash log:
https://pastebin.com/1wuCw1t3

something from codechicken is having an issue with the blockmodel, i have read soemthing about the block model data to be static but being not static when passed to the renderer creating this issue

Yeah something is trying to render our block and fails. Try reporting it to CodeChickenLib.