source upgrade of OS leaves pkg using pkg.freebsd.org non-functional

Hi,

A test vm (which was installed the 'traditional' way
15.0-PRERELEASE #0 main-n280049-b5c46895fddd), then pkg
and a few other pkgs like git-tiny and vim, was installed.

Then sources were grabbed with git clone https://git.freebsd.org/src.git

And then, a make kernel 
reboot
make buildkernel kernel
etcupdate -p
make installworld
etcupdate -B 
make check-old 
yes | make delete-old
yes | make delete-old-libs
reboot 
cycle was completed and a shiny new 
16.0-CURRENT (GENERIC-NODEBUG) #0 main-n280154-fd9e09cb2ab0 resulted.

Upon becoming root, running pkg bootstrap -f resulted in the following
output:

root@fbsd16-vm:~ # pkg bootstrap -f
The package management tool is not yet installed on your system.
Do you want to fetch and install it now? [y/N]: y
Bootstrapping pkg from pkg+https://pkg.FreeBSD.org/FreeBSD:16:amd64/latest, please wait...
pkg: Error fetching https://pkg.FreeBSD.org/FreeBSD:16:amd64/latest/Latest/pkg.pkg: Not Found
A pre-built version of pkg could not be found for your system.
Bootstrapping pkg from pkg+https://pkg.FreeBSD.org/FreeBSD:16:amd64/kmods_latest, please wait...
pkg: Error fetching https://pkg.FreeBSD.org/FreeBSD:16:amd64/kmods_latest/Latest/pkg.pkg: Not Found
A pre-built version of pkg could not be found for your system.

Is this expected?

I don't want to use pkgbase at all. I'd like the pkg facility for ports, though.
Usually this is in circumstances where I'd just want the vm (or baremetal)
system up and running and to configure a couple of tools.

Later on, I'd expect to have to hook it up to a local-net poudriere instance.
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