Issue in GTK apps on Wayland

Hey,

Below are my config files. These mappings are not working* in GTK apps (Evolution, Firefox, Gnome Terminal, etc..) But there is no error in Chrome / Electron-based apps (VSCode, Spotify, Google Chrome).

• Actually it is somehow working: To print a ( when pressed the left shift key, first, I have to keep pressing right shift and while pressing it if I press left shift there I have a ( on the screen. And vice versa to print a ). **

Do you have any idea why is that?

Distro: Fedora 33

Graphics: Wayland

Kernel: 5.9.13-200.fc33.x86_64

/etc/udevmon.yaml:

- JOB: "intercept -g $DEVNODE | dual-function-keys -c /home/ali/.dual-function-keys.yaml | uinput -d $DEVNODE"
  DEVICE:
    EVENTS:
      EV_KEY: [KEY_LEFTSHIFT, KEY_RIGHTSHIFT, KEY_CAPSLOCK]

~/.dual-function-keys.yml:

TIMING:
  TAP_MILLISEC: 200
  DOUBLE_TAP_MILLISEC: 0

MAPPINGS:
  - KEY: KEY_LEFTSHIFT
    TAP: [KEY_LEFTSHIFT, KEY_9]
    HOLD: KEY_LEFTSHIFT
  - KEY: KEY_RIGHTSHIFT
    TAP: [KEY_RIGHTSHIFT, KEY_0]
    HOLD: KEY_RIGHTSHIFT
  - KEY: KEY_CAPSLOCK
    TAP: KEY_CAPSLOCK
    HOLD: KEY_LEFTCTRL

Thanks!

UPDATE: Btw, the above setup is working without any problem when I switched to Xorg.

UPDATE 2: I added NAME as AT Translated Set 2 keyboard to the /etc/udevmon.yaml file just in case. No luck.