Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32u0/STM32U031/SYSCFG/SYSCFG_ITLINE31#0x0
SYSCFG interrupt line 31 status register
RNG interrupt request pending
https://github.com/modm-io/cmsis-svd-stm32