I usually play grounded 2 with my brother but it crashes alot.
We both have generally decent Internet speeds but when we are running on our ants 1 of us will freeze, this can be for a few seconds or as much as a minute then we start to move again, it only happens to 1 of us at a time.
We have tried swapping which of us is the host with no difference except the host crashes/freezes less often. Bugs/spiders often float over our heads or walk on invisible paths in the sky. I have had 4 buggies now because if the game crashes back to dashboard while I am on my buggie and the screen has frozen my buggie gets deleted once I return to the game, on 1 occasion the game froze while I was on my buggie then crashed to dashboard. When I logged back in and rejoined the game my buggie had somehow become my brothers buggie so both buggies in the nest were his and I didn't have 1. When we un-registered mine so I could take it back it vanished.
We are both on Xbox series X - 60-75mbps Internet and we make sure nothing else is connected to the Internet, we are also both hard wired (ethernet) so there shouldn't be this many issues. It doesn't happen as often to the host but it still happens.