I've found through trail and error that "suppress_notify=1" does nothing for this problem.
But these line's make "restore DC/Car visuals" work again:

[output]
notify=1
[serial]
car_rate=115200


(My reply's are a bit out off sync because I've read both your answers and replyed to the wrong one....
I'm strugling a bit with the fact that the original posting isn't showing when I reply)

Greetings, Robert