I tried the workaround. I tried installing Truenas on the same two boot-pool and has been a disaster. After rebooting there was no way to get into the system. I got stuck with:
Begin: Sleeping for … done.
Begin: Importing ZFS root pool ‘boot-pool’ … Begin: Importing pool ‘boot-pool’ using defaults … Failure: 1
Failure: 1
Command: /sbin/zpool import -N-f’boot-pool’
Message: cannot import ‘boot-pool’: no such pool available
Error: 1
Failed to import pool ‘boot-pool’ Manually import the pool and exit.
I tried reinstalling several times, also on a single disk, without success.
I resolved booting with a live cd, erasing both the disks with zeroes, and then reinstalling the system and restoring the config backup.
I hope I will not get again the same issue with the future updates.