Ctrl-g inside `guix shell --container emacs` broken

[t@fullmeta.me]

Hi Guix.

This one is both subtle and deadly given mussle memory we all 
develop with Emacs key bindings.

Tested with both Emacs 27 and 28:

$ guix shell --container --no-cwd --preserve='^TERM$' emacs -- 
emacs -nw -q -Q
or
$ guix shell --container --no-cwd --preserve='^TERM$' emacs-next 
-- emacs -nw -q -Q

Starts terminal Emacs fine. Now Ctrl-g or M-x followed by Ctrl-g 
which typically would send `keyboard-quit` and also 
abort-recursive-edit. You get kicked out of Emacs and shell ends 
up in a weird state, with Ctrl-D being the only way to kill 
it. Replicated in xterm and gnome-terminal.

This is specific to --container! The following works just fine:

$ guix shell --preserve='^TERM$' emacs -- emacs -nw -q -Q

For completness I also tried:

$ guix shell --container --no-cwd --preserve='^TERM$' emacs bash 
-- bash -c 'emacs -nw -q -Q'

Any idea where and why --container could be breaking things? Note 
that `abort-recursive-edit` works perfectly fine. How exactly 
--container starts those processes? Could it be running some weird 
"shell" version that treats C-g specially somehow? How do I make 
it stop?

$ guix describe
Generation 10	Dec 27 2021 15:36:01	(current)
  guix 9e9489f
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 9e9489fb11ac73e51abe293235738d70365affa9

Thanks