Ping!  Did you have time to try the fixed code now in the master
branch?

> Resent-From: Eli Zaretskii <eliz@gnu.org>
> Original-Sender: "Debbugs-submit" <debbugs-submit-bounces@debbugs.gnu.org>
> Resent-CC: bug-gnu-emacs@gnu.org
> Resent-Sender: help-debbugs@gnu.org
> Date: Thu, 02 Sep 2021 18:50:28 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 50266@debbugs.gnu.org
>
> > Date: Mon, 30 Aug 2021 16:41:04 +0300
> > From: Eli Zaretskii <eliz@gnu.org>
> > Cc: 50266@debbugs.gnu.org
> >
> > > From: Joakim Hårsman <joakim.harsman@gmail.com>
> > > Date: Mon, 30 Aug 2021 15:36:06 +0200
> > >
> > > No wait, scratch that. Emacs -Q has the same error. I accidentally started 27.2 where it works.
> > >
> > > On Mon, 30 Aug 2021 at 15:34, Joakim Hårsman <joakim.harsman@gmail.com> wrote:
> > >
> > >  emacs -Q works and returns the correct file name.
> >
> > OK, thanks.  I guess we don't decode the file name somewhere.  Hmm...
>
> Please try the latest master branch, I hope I fixed this.
>
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>