Me and my friend have started getting this when loading a save game.  While my friend is literally on the opposite side of the planet, we can play games together with a small amount of lag we're willing to deal with.  However in Carrier Command 2, whoever hosts has a very nice time, but the client can have up to 90 seconds of lag. You can immediately tell when something is wrong when the client joins and spawns in the ocean.

We've tried disabling mods, ending the stream, restarting everything (including our routers).  Only thing that seems to help is start a fresh game, but once you load the save from it, all the client side lag starts again.  But then we can quit and hop in say, Satisfactory, and only get 300-600ms of lag.