Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wba5/STM32WBA52/PWR/PWR_CR3#0x0
FSTEN=B_0x0
PWR control register 3
Regulator selection
Fast soft start
0 (B_0x0): LDO fast startup disabled (limited inrush current)
1 (B_0x1): LDO fast startup enabled
https://github.com/modm-io/cmsis-svd-stm32