freebsd-update(8) on a pkgbasify-enabled system

From: Graham Perrin <grahamperrin_at_gmail.com>
Date: Sun, 07 Sep 2025 20:23:31 UTC
 > The freebsd-update(8) utility cannot be used to upgrade to 15.0-ALPHA1.

Understood.

On RELEASE, I'm slightly surprised that the fetch and upgrade commands 
of freebsd-update can be valid after conversion to pkgbase:

<https://i.imgur.com/wjmSAVj.png>

Is that expected, at this time?