If installed through Snap and with iBus running the keyboard doesn't work in Standard Notes, XMind and Chromium apps on Manjaro 21.1. Killing iBus fixes the issue.
The keyboard works in Visual Studio, however

```
snap     2.51.3-2
snapd    2.51.3-2
series   16
manjaro  -
kernel   5.10.70-1-MANJARO
```

```
 sudo snap connections chromium                                                                                                                                                                                                                                         


Interface                 Plug                                    Slot                             Notes
audio-playback            chromium:audio-playback                 :audio-playback                  -
audio-record              chromium:audio-record                   :audio-record                    -
bluez                     chromium:bluez                          :bluez                           -
browser-support           chromium:browser-sandbox                :browser-support                 -
camera                    chromium:camera                         :camera                          -
content[gnome-3-28-1804]  chromium:gnome-3-28-1804                gnome-3-28-1804:gnome-3-28-1804  -
content[gtk-3-themes]     chromium:gtk-3-themes                   gtk-common-themes:gtk-3-themes   -
content[icon-themes]      chromium:icon-themes                    gtk-common-themes:icon-themes    -
content[sound-themes]     chromium:sound-themes                   gtk-common-themes:sound-themes   -
cups-control              chromium:cups-control                   :cups-control                    -
desktop                   chromium:desktop                        :desktop                         -
desktop-legacy            chromium:desktop-legacy                 :desktop-legacy                  -
gsettings                 chromium:gsettings                      :gsettings                       -
home                      chromium:home                           :home                            -
joystick                  chromium:joystick                       :joystick                        -
mount-observe             chromium:mount-observe                  -                                -
mpris                     -                                       chromium:mpris                   -
network                   chromium:network                        :network                         -
network-bind              chromium:network-bind                   :network-bind                    -
network-manager           chromium:network-manager                -                                -
opengl                    chromium:opengl                         :opengl                          -
password-manager-service  chromium:password-manager-service       -                                -
personal-files            chromium:chromium-config                :personal-files                  -
pulseaudio                chromium:pulseaudio                     -                                -
raw-usb                   chromium:raw-usb                        -                                -
removable-media           chromium:removable-media                :removable-media                 -
screen-inhibit-control    chromium:screen-inhibit-control         :screen-inhibit-control          -
system-files              chromium:etc-chromium-browser-policies  :system-files                    -
system-packages-doc       chromium:system-packages-doc            :system-packages-doc             -
u2f-devices               chromium:u2f-devices                    :u2f-devices                     -
unity7                    chromium:unity7                         :unity7                          -
upower-observe            chromium:upower-observe                 :upower-observe                  -
wayland                   chromium:wayland                        :wayland                         -
x11                       chromium:x11                            :x11                             -
```
```
sudo snap connections standard-notes

Interface                 Plug                                     Slot                             Notes
audio-playback            standard-notes:audio-playback            :audio-playback                  -
browser-support           standard-notes:browser-support           :browser-support                 -
content[gnome-3-28-1804]  standard-notes:gnome-3-28-1804           gnome-3-28-1804:gnome-3-28-1804  -
content[gtk-3-themes]     standard-notes:gtk-3-themes              gtk-common-themes:gtk-3-themes   -
content[icon-themes]      standard-notes:icon-themes               gtk-common-themes:icon-themes    -
content[sound-themes]     standard-notes:sound-themes              gtk-common-themes:sound-themes   -
desktop                   standard-notes:desktop                   :desktop                         -
desktop-legacy            standard-notes:desktop-legacy            :desktop-legacy                  -
gsettings                 standard-notes:gsettings                 :gsettings                       -
home                      standard-notes:home                      :home                            -
network                   standard-notes:network                   :network                         -
opengl                    standard-notes:opengl                    :opengl                          -
password-manager-service  standard-notes:password-manager-service  -                                -
pulseaudio                standard-notes:pulseaudio                :pulseaudio                      -
unity7                    standard-notes:unity7                    :unity7                          -
wayland                   standard-notes:wayland                   :wayland                         -
x11                       standard-notes:x11                       :x11                             -
```