I suspect this is due to reset ordering. The host will always reset [mcu] first followed by the secondary [mcu x] chips in the order they are defined in the config file. Unfortunately, this means that if a “bridge mcu” is reset before a canbus mcu, then the bridge wont be able to pass the reset signal along to the canbus mcu.
I’ll have to think about how to solve this. I suppose the host could detect bridge mcus and arrange to reset them last.
-Kevin