Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wl/STM32WL5x_CM4/EXTI/EXTI_C2IMR1#0x0
IM=B_0x0
EXTI interrupt mask register
Wake-up with interrupt mask on event input x For each bit of this field:
0 (B_0x0): Wake-up with interrupt request from line x is masked.
1 (B_0x1): Wake-up with Interrupt request from line x is unmasked.
https://github.com/modm-io/cmsis-svd-stm32