RTK/GPS inject changes baudrate which causes problems

I am using a radio link between my laptop and the GNSS base station using a USB to serial converter.
The connection is like this:
Laptop <-> USB to serial(UART) <-> radio (fixed to 115200) <-> serial(UART) <-> GNSS base station
When pressing connect or restart Missionplanner is changing the baudrate to 460800 bps because this is supported by the USB to serial converter. But this is not supported by the radiolink. So the communication stops. Disabling M8P/F9P autoconfig fixes this problem, but then the SurveyIn Acc settings and table disappears. Why isn’t this shown all the time? Can this be fixed somehow?