Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Fri, 19 May 2023 08:30:46 +0200
>> From: Andreas Kurth <emacs@akurth.de>
>> 
>> after setting package-install-upgrade-built-in to a non-nil value, the
>> command "M-x package-menu-mark-upgrades" won’t show upgradeable non
>> built-in packages (magit, embark, ...) any more. Same for pressing "U"
>> in the package menu. Also, the command "M-x list-packages" won’t
>> announce upgradeable packages in the echo area.
>> 
>> Setting package-install-upgrade-built-in to nil will revert that
>> faulty behaviour.
>> 
>> I bisected the error to commit
>> ba2c76fa2bc3aabfda7d1d09cc5148f3f9d8e08e in emacs-29 branch.
>
> Philip, could you please look into this issue?

I've taken a look at the issue, and think this small change should fix
the issue: