Hey, so it seems I still have issues but IDK if it is me or the container that is the problem.
I deleted the container and the appdata, then re-installed the container. I put my key in, generated the world, and logged in. When I tried to go into a cave it acted like it would load, then spat me back out at another cave entrance in the overworld. I went back into the cave and it did it again. It's like it's not actually connecting to the cave world, but it tries to. My logs are below:
https://pastebin.com/1cdEuPNB