($ sudo apt install fonts-noto-color-emoji
if you don't have it installed)
$ fc-cat /var/cache/fontconfig/* | grep NotoColorE
there is a result listed
"NotoColorEmoji.ttf" 0 "Noto Color Emoji:familylang=en:style=Regular:stylelang=en:fullname=Noto Color ...
$ sudo rm -rf /var/cache/fontconfig/
$ sudo snap refresh --edge core
(there is probably a smarter way to trigger a fontconfig cache refresh from snapd but that did it)
$ fc-cat /var/cache/fontconfig/* | grep NotoColorE
-> not NotoColorEmoji.ttf result anymore
Confirmed by doing those steps on a focal system
($ sudo apt install fonts-noto- color-emoji
if you don't have it installed)
$ fc-cat /var/cache/ fontconfig/ * | grep NotoColorE
there is a result listed
"NotoColorEmoji .ttf" 0 "Noto Color Emoji:familylan g=en:style= Regular: stylelang= en:fullname= Noto Color ...
$ sudo rm -rf /var/cache/ fontconfig/
$ sudo snap refresh --edge core
(there is probably a smarter way to trigger a fontconfig cache refresh from snapd but that did it)
$ fc-cat /var/cache/ fontconfig/ * | grep NotoColorE
-> not NotoColorEmoji.ttf result anymore