Don't have time right now to do a custom build, but as sanity check, I just quickly pulled the 28.2 gnu.org.emacs flatpak and tried that and I get exactly the same issue, so it doesn't appear to be specific to the snap build. I can't find a 29 snap or flatpak to test, though.

On Mon, May 8, 2023 at 10:40 AM Eli Zaretskii <eliz@gnu.org> wrote:

> From: James Mazer <mazerj2006@gmail.com>
> Date: Mon, 8 May 2023 10:28:59 -0600
> Cc: Ruijie Yu <ruijie@netyu.xyz>, 63363@debbugs.gnu.org
>
> Can you give me any info on how you tried to reproduce it? OS, installation method etc?

I did exactly what you said I should do:

emacs -Q foo.py

I also tried starting "emacs -Q" and "C-x C-f foo.py" from inside
Emacs. Neither of these two reproduced the problem.

As for the OS, I tried this on GNU/Linux and on MS-Windows, with
negative results in both cases.

My Emacs is built by myself and installed on the system where it was
built.