GPS time is wrong Rover4.2

When I updated to Rover4.2, I get different local time using
AP::rtc().get_local_time(hour, min, sec, ms),
everytime reboot machine. the RTK status is fixed.

Rover 4.1 can get accurate local time, there is not any issue.

I tried normal GPS, its time is correct.
and BRD_RTC_TZ_MIN does not work.