pkgbase versus /root/.cshrc again (third loss)

From: Graham Perrin <grahamperrin_at_gmail.com>
Date: Wed, 20 Mar 2024 08:28:03 UTC
On 14/03/2024 02:51, Graham Perrin wrote:
>
> 15.0-CURRENT. Upgraded from *150014 to 1500015*, if that's relevant.
>
> Customisations to  /root/.cshrc were lost. …
>
Lost again.

Most recently: as far as I can tell, lost with an upgrade from *1500015 
to 1500016*.

Retrospective: 2024-02-16 00:58 I mentioned a problem with /root/.cshrc 
at 
<https://discord.com/channels/727023752348434432/1204547751925391360/1207853822953922571>. 
Reading that alongside 
<https://docs.freebsd.org/en/books/porters-handbook/versions/#versions-15> 
and my 
<https://gist.github.com/grahamperrin/86359cb7c6d1316d75f340fb305484ed>:

– 2024-02-1523:09 was /probably/ my transition from *1500013 to 1500014*.

I'll temporarily boot 1500013-e and 1500014-a, to confirm.

(Boot environment 1500014-a was created around two hours before my 
comment in Discord.)

So, do we have a bug that bites only at version number change time?

I can't find anything matching in Bugzilla …