Fcitx does not works on some snap apps.
Fcitx does NOT works on (as far as I confirmed): spotify, vlc, code, kdenlive, obs-studio, skype, slack
Fcitx works on: discord, gimp, libreoffice, mikutter, ora, snap-store, superproductivity
snap 2.43.3-1
snapd 2.43.3-1
series 16
arch -
kernel 5.5.8-arch1-1