Current save rule
- Character growth is attached to the guest's selected slot.
- The independent save interval is 30 seconds.
- Host world saves and guest character saves are distinct.
Rejoining safely
- Select the same character save before joining again.
- Confirm appearance, inventory, skills and perks after joining.
- Use the recovery guidance if an older co-op save held prior progress.
Evidence boundary
Network, platform and old-save edge cases vary. Treat the official fix list as a starting point and record reproducible exceptions rather than assuming one universal cause.