Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F303/EXTI/IMR2#0x0
Interrupt mask register
Interrupt Mask on external/internal line 32
Interrupt Mask on external/internal line 33
Interrupt Mask on external/internal line 34
Interrupt Mask on external/internal line 35
https://github.com/cmsis-svd/cmsis-svd-data