Player data keeps getting reverted / lost

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You’re using SetAsync which has no regard for previous data.

Imagine a scenario:

  1. Player joins server A
  2. Server A loads player’s data
  3. Player’s data changes in that server
  4. Player leaves Server A, triggering a save
  5. Server A starts saving Player’s data, but it is taking some time
  6. Before Server A finishes saving the Player’s data, Player joins a new server: Server B
  7. Server B loads player’s data which is the not-yet-updated copy of it
  8. Server A finally finishes saving, updating the data but it’s too late because Server B already loaded outdated data
  9. Player leaves server B because they see they lost data, triggering a save
  10. Server B saves their oudated copy of the data, overwriting the newer data that Server A had saved with outdated data

The remedy to this is using Session locking. I found a community tutorial for it here: Session locking explained (Datastore)

But other community modules like ProfileService handle this out of the box if you want a ready-made solution.

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