Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32u5/STM32U535/DCACHE/DCACHE_FCR#0x0
DCACHE flag clear register
CBSYENDF
CERRF
CCMDENDF
https://github.com/modm-io/cmsis-svd-stm32