Based on my testing, I believe the "@DayZ-Expansion-Spawn-Selection" mod is causing the data saving issue. After removing this mod from my server, no saving problems were observed during the testing phase. There is a compatibility mod on the Steam Workshop from June, but when I tried it, I found that after transferring servers, players would respawn using the Spawn Selection menu instead of transferring normally. Additionally, it caused the ESC menu to become unresponsive.

So if you want to install Maplink on a server using the Expansion mod, the only option is to remove "@DayZ-Expansion-Spawn-Selection" and give up custom spawn points, loadouts, and territory respawns.
Hopefully, Zenarchist or other highly skilled individuals can attempt to fix this issue. Thank you very much for your efforts!

I had my suspicions about this mod before, after your post I was convinced that the mod conflicts, if I find a solution, I will definitely post it here

I found a way to do this without removing the mod. "EnableSpawnSelection": 0, and the problem is solved.

Originally posted by Mika:

I found a way to do this without removing the mod. "EnableSpawnSelection": 0, and the problem is solved.

After setting "EnableSpawnSelection": 0, the spawn system behaves like the vanilla version. My server needs some spawn loadout configurations and territory respawns. Is there a good solution for this?