bug#40940: 27.0.91; project-query-replace-regexp stops too early

[Eli Zaretskii]

> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Wed, 29 Apr 2020 06:54:22 +0300
> Cc: Stefan Monnier <monnier@IRO.UMontreal.CA>
> 
> > The replacement process stops with point before "foo" in test-2.txt
> > with a message "Replaced 0 occurrences", without replacing "Foo" in
> > test.txt as it should have.
> > 
> > The bug appears both in emacs-27 as of
> > 16fed05ba85c3d92d3c913657dd50a648ad3884a, and on master as of
> > 771a6b68165b986b6bf9249c57ca11d310b0f0e4.
> 
> I can confirm this. Tested with the current emacs-27.

Do we need to fix this in emacs-27?  Is this a regression since Emacs 26?