Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wl/STM32WL5x_CM0P/RTC/SCR#0x0
SCR
Clear alarm A flag
Clear alarm B flag
Clear wakeup timer flag
Clear timestamp flag
Clear timestamp overflow flag
Clear internal timestamp flag
Clear SSR underflow flag
https://github.com/modm-io/cmsis-svd-stm32