Thanks for the reply. The soft link is to the actual saved game directory itself. All of those files are in that directory.
I should explain this a little better.
By default, these are the original directories:
Saved games: /home/username/.local/share/Steam/steamapps/compatdata/251570/pfx/drive_c/users/steamuser/AppData/Roaming/7DaysToDie/Saves/
Worlds: /home/username/.local/share/Steam/steamapps/compatdata/251570/pfx/drive_c/users/steamuser/AppData/Roaming/7DaysToDie/GeneratedWorlds/
I installed the server to: /home/username/7d2d_server/
And the server sets up a world directory: /home/username/7d2d_server/Data/Worlds/
And a saves directory: /home/username/.local/share/7DaysToDie/Saves
I copied the world folder over from the default install to the server worlds directory.
I originally copied the saved game folder from the default install to the server saves directory. Everything went well, but I didn't want to have 2 different versions of the same saved game. I wanted to try an experiment. So I removed the copied saved game folder, and replaced it with a symlink to the original saved game directory like this: 'ln -s "/home/username/.local/share/Steam/steamapps/compatdata/251570/pfx/drive_c/users/steamuser/AppData/Roaming/7DaysToDie/Saves/Old Veyigu Mountains/OffKilter3/" .' <-- That's a space, then a dot for the current directory.
Now we're working with a single set of saved game files. Everything BUT the fog of war is working perfectly. I could only "Join" the game after starting the server, and I wouldn't "Continue" the game while the server is running. The server hasn't modified anything in the Worlds directory since I set it up. But it works with the saved game files just fine.
Could it be the profiles.sdf files? There's one in each saved game location - outside of the individual saved game folders... I doubt it's that, it's only 1.1 kb. But perhaps if they're different, the game just wipes the uncovered part of the map? That's the only thing I see that might be causing it.
And yeah, seems to be the same issue.