Real Time Clock, RTC sd3231, resets to 1970 after poweroff

The new Armbian release “bookworm” doesn’t solve the problem with the RTC module sd3231 or sd1307. hwclock -w, hwclock -r, hwclock -s and hwclock -v works fine, and hwclock -v does not show any errors. After a power down, the RTC module comes back (hwclock -r) with the factory setting 1970 Please help me with this problem. I’m using the BPI M2 Zero as an access point and a real time clock is essential.