Non root zpool not imported across freebsd-update 13 to 14

I did a sequence of freebsd update from 13.1 through 13.2 and 13.5 to 14.3
and somewhere along the journey a tank didn't get imported.

All I had to do was a zpool import, but I wondered if it's normal for this
to happen.

No data loss. Some hair loss before realizing it wasn't wiped out (the top
level empty /tank)

More update than fs, but asking here anyway.

George