Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32L562/DMAMUX1/RGSR#0x0
DMA Request Generator Status Register
Generator Overrun Flag 0
Generator Overrun Flag 1
Generator Overrun Flag 2
Generator Overrun Flag 3
https://github.com/cmsis-svd/cmsis-svd-data