Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32g0/STM32G031/SYSCFG/ITLINE29#0x0
interrupt line 29 status register
USART3
USART4
LPUART1
USART5
USART6
https://github.com/modm-io/cmsis-svd-stm32