Well, I messed things up. Everything had been working perfectly with my binhex-minecraft docker and world. I decided to add a graphics card to my unRAID setup to experiment with cloud gaming via VM (I was following this guide: https://forums.serverbuilds.net/t/guide-remote-gaming-on-unraid/4248/7 (pasting the link here doesn't seem to work). Before I got to Step 7 in creating the VM, I decided to make sure nothing was messed up with Minecraft. Alas, things were messed up. There appears to be a ton of server latency now, and it disconnects between 30sec - 80sec with the error: "Connection Lost - Internal Exception: java.net.SocketException: Connection reset." I have to shut down the server, and restart it in order to join again. But, the same issue occurs. I've removed the graphics card, and uninstalled the plugins I used in the guide, but the issue still exists.
Any help is appreciated.
UPDATE: I copied the binhex-minecraft appdata, and went ahead and nuked the docker installation. I reinstalled it, had it generate a new world, then overwrote that world folder with my old one. It works! No more issues. Though, I still would appreciate insight on what could have caused the issue. I'll attempt the graphics card installation another time, but skip all the pre-work from that guide since it more than likely caused the issue (or running one of the plugins).