lots of "no such file or directory" errors in zfs filesystem

[Chris Anderson]

I'm in the process of decommissioning an old zfs based file server and I
noticed that around a dozen files with directory entries which fail with
"No such file or directory" when trying to read them.

I can't remember what the original version of freebsd installed was, but
it's been in production for at least 7 years and has been upgraded with
freebsd-update as new FreeBSD releases came available (it is currently on
12.2-RELEASE-p3).

The behavior is perplexing since I've never had any scrub failures on the
pool those files reside in yet from looking at old security run outputs,
the number of files in that state has increased over time.

None of these files are especially important to me, however I was wondering
if there would be any benefit to the community from trying to debug this
issue further to understand what might be going wrong.