When I join my own server, the progress my (and other) characters have done rolls back. I have tried restarting it. It's not really a big deal since I'm on creative and I can just respawn my stuff, but it seems that my player.dat file just doesn't change at all.
I honestly don't know how to replicate this and the server has a good amount of command blocks, so if you want I'll give you the IP and you can check it out for yourself or I'll send you the map.
Please close. All my memory was used, so the data couldn't be saved. Although, I might make a new report soon, since there seems to be something occupying all my memory, considering an empty world is using 5 GB.