I just testet all available stable armbian images with radxa zero 3e. when i turn off the machine with shutdown -h 0 or poweroff the system shuts down successfully but the power of the dc dc is not turned off.
the 3.3V is still available. i dont know if its only a configuration mistake or a bug. normaly after a kernel shutdown, the driver for rk817 should send i2c package to reset the 817. after that you need a power cycle to recover and restart.
https://paste.armbian.com/inibopomew
br
manuel