When I look into the compass tab in MP my here 4 shows up as 2 compasses.
I am posting this if it may be a bug or a user error (me).
I havent tried to update to the newest beta 4 yet. I know that I can delete on of them under that same tab.
Set BRD_BOOT_DELAY,3000
In you parameters Compass1 doesnt exist, and Compass 2 and 3 are there.
Go into the MissionPlanner compass calibration section and try “remove missing” and reboot.