Server: Being seated on login breaks O2 alerts and visor.
Log into a server.
Go to an O2 planet in a lander.
Open your visor.
Open the door so it is not pressurized (if enabled).
Sit in a seat.
Logout for a few minutes.
Log back in.
You should immediately notice the choking sounds and get the health loss effects.
Closing your visor stops the sounds and the false health loss.
Opening you visor make you appear to be choking.
Add a block to the Grid, resets the behavior to normal.