Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wb0/STM32WB05/RNG/RNG_SR#0x0
RNG_SR register
New Random Value Ready.
RNGCLK Clock Reveal bit.
Fault Reveal bit.
https://github.com/modm-io/cmsis-svd-stm32