I think i saw something equivalent maybe on discord but not sure so i post it here.

Coop host
No Mod
Ports are allowed in the router
Game allowed in the firewall

I was pulling a trailer with a truck equiped with a crane on it.
While driving on ice patch the sound cue from being disconnected from a lobby played and the truck i was driving disapeared along side all the object on the Lake Kovd location (both map).

Nothing remaining.

It didn't affect Alaska or Michigan or Taymir.

Prior to that a player was trying to join the session while constantly getting disconnected or laging when he was on the map.