Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32G473xx/FDCAN1/RXF0S#0x0
FDCAN Rx FIFO 0 Status Register
F0FL
F0GI
F0PI
F0F
RF0L
https://github.com/cmsis-svd/cmsis-svd-data