Bootloader timestamp

[urbanze]

Timestamp used by bootloader and 2nd bootloader is CPU cycle counter and after scheduler are RTOS tick, OK.

However, I tried to find time that RTC WDT is enabled and found one curious detail: Timestamp go back (rollback) before RTC WDT, why?
Line with "chip revision" = 89 cycles
Line with "bootloader 2nd stage" = 47 cycles

Whats happen? Why? What is the real RTC WDT startup time? 89+48?