[PC-Epic][1.0.38.0.29][Multiplayer] De-sync disconnects and weird game behavior

Summary
Playing in multiplayer (co-op).

  • Every 4 hours long session (save reload) there are 1-3 disconnects of connecting player from host. In random situations.
  • Every 2nd session (save reload) a connecting player starts with Poisoned effect he did not have before. Sometimes possibly with other type of negative effect.
  • Randomly at start of a session (save reload) a connecting player starts with…
    • some objects missing from his inventory. Sometimes I think some of those objects spawn on the ground instead.
    • some objects from his inventory will behave strange for the rest of session:
      • Randomly disappearing and again reappearing in his inventory.
      • Disappearing from inventory and dropping to the ground by themselves.

Some side observations:

  • In multiplayer lobby, games shows surprisingly high ping: 130 ms
    (Understandable if the game uses server for synchronization. Strange if it uses P2P.)
  • Loading a multiplayer save in 2 players co-op session, the ‘‘Loading. Sync World’’ phase takes very long. About 2 minutes. Seems strange for the high internet speeds we both have.

Technical info
Both players:
PC. Windows 10 and 11. Running Epic version of the game and same build version.
Physically in the same building, only separated by 2 home routers with full PnP support.
With stable, high speed, cable internet connection. DL 830 Mbps, UL 860, Ping 13ms

Seed
#54277006 (If it is the number in a top right corner of cartographer)

Settings
Both players: Vanilla game. No mods. No custom islands. Some graphic options set to High.

Extras
-Have you tried reloading your save, game or PC? Yes. Multiple times. Problems persist. Or are actually caused by reload.

-Have tried reinstalling the game? No.

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