Hello,
First, I would like to apologize for the late response. I imported your project and I noticed a couple of things that got my attention.
The following warnings.

Your callbacks only receive three parameters.

However, the type flexcan_callback_t receives 4 parameters, you are missing the buffIdx.

Also, in your function CAN_INIT, you are initializing two times the same instance.

Have a great day,
TIC
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