Will not allow configuring both USB and CAN at the same time (forces both to PA11/PA12). Trying to configure USB on PA11/PA12 and CAN on PB8/PB9. CAN shows up in override list for PB8/PB9 but pins turn orange and state ''no mode'' when selected.
You might want to check the whole F3 line. I am also looking at the F302 for the design and the CB and CC parts have the same problem but, interestingly enough the C6 and C8 parts don't.
