Custom keyboard layout that rebinds "m" causes magit helm branch selector to not work

[lilactown]

Description

I've started using a new keyboard layout called colemak-dhm. It is slightly different than standard colemak,
so I added my own custom rebinding to the keyboard-layout layer locally.

    (colemak-mnei
     . (("m" . "h")
        ("n" . "j")
        ("e" . "k")
        ("i" . "l")
        ;;
        ("h" . "m")
        ("j" . "n")
        ("k" . "e")
        ("l" . "i")))

This works great, except that now when I try and creat a new branch using magit, I am unable to select
a branch to base it off in the helm list. Fitering the list works fine but when I press enter, it toggles
between showing the history rather than selecting.

Other helm list selection seems to work OK like selecting a directory using SPC f f.

Using the built-in colemak-hnei does not have this behavior.

Any ideas on why this is happening and how to fix this for my custom colemak-mnei?

Reproduction guide 🪲

• Start Emacs
• Add colemak-mnei to kl--base-rebinding-maps in ~/.emacs.d/layers/+intl/keyboard-layout/config.el
• Update layer config in ~/.spacemacs to use (keyboard-layout :variables kl-layout 'colemak-mnei)
• Restart Emacs
• Open a file in a git repo
• Open magit status buffer SPC g s
• Create a new branch b c
• Press RET

Observed behaviour: 👀 💔
Helm list toggles between history and list of all branches

Expected behaviour: ❤️ 😄
Should select whichever branch is under cursor.

System Info 💻

• OS: darwin
• Emacs: 27.2
• Spacemacs: 0.999.0
• Spacemacs branch: develop (rev. 42dc30e)
• Graphic display: t
• Distribution: spacemacs
• Editing style: vim
• Completion: helm
• Layers:

(typescript javascript rust
            (scheme :variables scheme-implementations
                    '(chicken))
            python yaml clojure
            (keyboard-layout :variables kl-layout 'colemak-mnei)
            emacs-lisp git helm lsp multiple-cursors treemacs)

• System configuration features: NOTIFY KQUEUE ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS MODULES THREADS JSON PDUMPER

Backtrace 🐾

<<BACKTRACE IF RELEVANT>>

[lilactown]

I found a workaround for now which is to disable the remapping in helm:

     (keyboard-layout :variables
                      kl-layout 'colemak-mnei
                      kl-disabled-configurations '(helm))

btw, is there any interest in upstreaming the colemak-mnei layout? It keeps movement keys on the homerow for users who use the Colemak-DHm variant.