I just happened to open this emoji selection in Plasma and was a bit taken aback by the broken character display. Not that I would ever need these emojis, but what is installed should work correctly. Apparently there is something else that needs to be installed:
By the way: for some time now, after I close Spectacle (screenshot tool), I get the error message: Spectacle quit unexpectedly.
Dug a wee bit, pacman -Qi ibus-ui-emojier-plasma comes up with nothing, as does pacman -Ss ibus-ui-emojier-plasma, meaning it’s not a package of its own. pacman -Qo ibus-ui-emojier-plasma tells me it’s in fact owned by plasma-desktop, and that obviously doesn’t have noto-fonts-emoji linked to it in any way.
However, both plasma-integration and qt5-webengine require noto-fonts, of which noto-fonts-emoji is an optional dependency.
All of the above packages are maintained by the same person, so might want to leave them something on the Arch forum and hope they read it (might not want to email them, that’s bad manners ).
Clearly, that means Manjaro ships noto-fonts-emoji by default
Try pacman -Qi noto-fonts-emoji on your Manjaro installation and see if it has noto-fonts under Optional For, like in EOS, or under Required By. My guess is it’s the latter (unless you explicitly installed it yourself, of course).
Edit: I just realised that’s not going to make any difference if Manjaro uses the Arch repos like EOS does, and I’m unsure if they do…
Unfortunately, I can’t try that anymore. The computer in question (my wife’s computer) no longer has Manjaro installed. I have installed her yesterday still EnOS)