[Bug 287420] upgrade to 14.3 made zfs unbootable

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287420

            Bug ID: 287420
           Summary: upgrade to 14.3 made zfs unbootable
           Product: Base System
           Version: 14.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: pi@berkeley.edu

I just did a `freebsd-update -r 14.3-RELEASE upgrade` on a 14.2 system
(followed by `install` ) and on reboot now cannot get the system to boot into
FreeBSD. 
After `Setting currdev to zfs:rpool:` I see several `zio_read error: 5` and 
`ZFS: i/o error - all block copies unavailable` messages, with a `Failed to
find bootable partition` and an `ERROR: cannot open /boot/lua/loader.lua: no
such file or directory` at the end.  One thing that might be related to this is
that I have been running an unencrypted boot with an encrypted root partition
as described in this forum thread
(https://forums.freebsd.org/threads/the-quest-for-unencrypted-boot-and-zfs-native-encrypted.91940)
 and one of the messages during `freebsd-update -r 14.3-RELEASE install` that
might have been the source of the pain I'm dealing with was 

`Installing updates...Removing conflicting directory ///boot/boot`

I am able to boot the system from an iso and both the unecrypted boot pool and
the encrypted root pool are fine. It seems that the upgrade did not leave the
contents of /boot in a bootable state.

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