can not boot from second disk after installation which computer use zfs and raid1

hello Expert:

It's glad to discuss with you.
here is my issue:

I have an computer which has 2 sata ssd, and i install freebsd 13.2 in the
computer.
during the installation stage, i select to use zfs  and raid1, choice uefi
as the boot support.

after the installation, test only the first disk
 can be boot.
only one bootable disk can be found in the bios's boot menu.
if i remove the first disk, i can not boot into the
 system.

try use the command gpart bootcode
 to write the bootcode into the second disk, but not work.

google's result is also no help for this issue.
launch this session to ask if someone face the same question or can give
some solution to fix this. very thanks.

br/armin