zpool suddenly thinks there is a mismatch for system id

[clhedrick]

System information

Type	Version/Name
Distribution Name	Redhat
Distribution Version	9.7
Kernel Version	5.14.0-611.11.1.el9_7.x86_64
Architecture	x86_64
OpenZFS Version	2.3.5

Describe the problem you're observing

Smart reported a disk was going to fail
Attached a new one to the mirror
Silvered
At the end of the resilver, zpool status shows

pool: backup
state: ONLINE
status: Mismatch between pool hostid and system hostid on imported pool.
This pool was previously imported into a system with a different hostid,
and then was verbatim imported into this system.
action: Export this pool on all systems on which it is imported.
Then import it to correct the mismatch.
see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-EY
scan: resilvered 10.8T in 1 days 04:25:02 with 0 errors on Tue Dec 2 14:02:44 2025

The pool is working fine.

huh?

Describe how to reproduce the problem

Include any warning/errors/backtraces from the system logs

[clhedrick]

zdb -C shows a hostid that looks like the current IPv4 address with bytes swapped. The system was recently rebooted. There was no problem with the automatic import.

A zpool.cache file from a few days ago, before recent reboots, shows no hostid and a hostname of localhost.