Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wb0/STM32WB05/RADIO_REG_REG/AGC12_DIG_ENG#0x0
AGC12_DIG_ENG register
Attenuation at IF Level for the AGC step 2
Attenuation at LNA Level for the AGC step 2
Attenuation at Antenna Level for the AGC step 2
https://github.com/modm-io/cmsis-svd-stm32