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TMS320F28335: Does two CAN of TMS320F28335 need to work at the same time?

Part Number: TMS320F28335

We have a board which CAN A of the 1st TMS320F28335 communicates with CAN  of one TMS320F28377 , and CAN B of the 1st TMS320F28335 communicates with CAN A of the 2nd TMS320F28335. We found if CAN A of the 1st TMS320F28335 stop working due to bus-off, then the CAN B of 1st TMS320F28335 also stop working. Does two CAN of TMS320F28335 need to work at the same time?  Or are they independent? What is the possible reason for this issue?

Your help is very appreciated!