So turns out only my copy of the game as an issue.
its a connection issue
My brother also plays simpleplanes MP and when he joins he can see me and the rest of the whole server, but i cannot see him, and the other people on there.
When i can finally see someone after 15 minutes of a wait the log starts a constant spam of
"Setting linear velocity of a Kinematic velocity of body is not supported.".
every time someone restarts it resets the timer and i need to wait for an eternity again.
And this while i am only 2 meters from my brother.
(Yes we do have the last version of the game)
Why?
It's the game version
roll back to 1.12.128.0 and it'll buff out.
Reverting back to v1.12.128.0 should fix the kinematic body error. It may fix the rest, too, but I'm not certain. The multiplayer mod seems to be a bit broken on any versions past v1.12.128.0
Idk im mobile