U2C v2.1 was found a lots of error issue

[ZISQO]

hi there
i was flashed can-fd firmware from U2C_V2_STM32G0B1.bin.
but it's found bytes_retransmit=20 and bytes_invalid=10~90 on klippy.log a lots of lines over 1,000 lines.
also that value was affected same even small or bigger(10 to 5,000) txquelen value(as i think shouldn't happen will be better to use.

at this moment i couldn't fixed up and rebuild or modifying by myself without candleLight source for U2C_V2_STM32G0B1.
how'd you think about to share that self build sources of candleLight_fw for STM32G0B1 on github?

this issue gotta Stop and Shutdown MCU or EBB36 if found that bytes_retransmit and bytes_invaild values.

• Octopus 446 (set by can pd0/pd1 via canboot bootloader)
• Ebb36 (set by can pb8/pb9 via canboot bootloader)

! when using U2C v2.1(STM32G0B1) - a lots of timeout error when g28 and stuck & must be reboot at 2~3 layers when printing

! when using U2C v1.1(STM32F072) - nothing on problem