Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wl/STM32WL5x_CM4/RNG/SR#0x0
status register
Data Ready
Clock error current status
Seed error current status
Clock error interrupt status
Seed error interrupt status
https://github.com/modm-io/cmsis-svd-stm32