The M5Stack Mini Can does have a built in termination resistor. The schematic shows R1 as 120 ohm. If this is fitted to every unit on a Can bus IE more than 2 we will end up going out side of the spec for approximately 60 ohms. One could attempt to remove the small SMD resistor from the board which I think is the one high lighted in this picture.

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Can someone confirm this is the correct one. It would have been good if the unit had a jumper so you could enable it if required. I know a lot of board on the internet have also followed this trend of adding the terminator resistor.