Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7/STM32H742/DBGMCU/APB2FZ1#0x0
DBGMCU APB2 peripheral freeze register
TIM1 stop in debug
TIM8 stop in debug
TIM15 stop in debug
TIM16 stop in debug
TIM17 stop in debug
HRTIM stop in debug
https://github.com/modm-io/cmsis-svd-stm32