I would just ran an upgrade on a pool at version 18 to version 22.
zpool upgrade euclid
This system is currently running ZFS pool version 22.
Successfully upgraded 'euclid' from version 18 to version 22
And then look ad zdb.
zdb
euclid:
version: 18
name: 'euclid'
state: 0
txg: 234922
pool_guid: 4786614771504599496
hostid: 4343974
hostname: 'euclid-clevo'
vdev_children: 1
vdev_tree:
type: 'root'
id: 0
guid: 4786614771504599496
children[0]:
type: 'disk'
id: 0
guid: 2080840568716594129
path: '/dev/dsk/c4t0d0p2'
devid: 'id1,s...@sata_____st9320423as_________________5vj0tb3s/s'
phys_path: '/p...@0,0/pci1558,8...@1f,2/d...@0,0:s'
whole_disk: 0
metaslab_array: 23
metaslab_shift: 31
ashift: 9
asize: 256048103424
is_log: 0
rewind_txg_ts: 1283472786
seconds_of_rewind: 0
verify_data_errors: 0
So I would say that the upgrade is not changing the pool header information.
This is probably a bug.
zpool get version does report the proper pool version.
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