Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h5/STM32H533/TIM12/TIM12_CNT#0x0
TIM12 counter
or UIFCPY: Value depends on IUFREMAP in TIMx_CR1.
UIF Copy
https://github.com/modm-io/cmsis-svd-stm32