I will try, but it requires more logistics as I have my Lambda2CAN module 450km away from the workshop and no tools to connect it, so I will need to send it to my workshop and ask for plugging it and checking according to my guidance.
Attaching screenshot of the light client and USB2CAN connected to Black V3 only. As you can see no errors here. Status is OK. That I think confirms that both USB2CAN and Black V3 CAN is ok?
Is that enough to say it Lambda 2 CAN triggering the errors or I still should do the test you asked?
A small update, as I figured out the misfire might be caused by CAM-Sync issue, as reported here:
It seems, taking into consideration the above, that only the problem with communication remains (red LED on USB2CAN, and messages in Light Client). No idea if this might be HW or V3 SW related.
I did power up the light client with nothing but 2x 120 Ohm resistors at the ends of the bus, speed set by hand (as there are no devices on the bus). Seems fine to me.