In Emoji Picker there show up lots of emojis as white spaces instead. When copying them, a black/white line-style emoji shows up, not a colored one. The b/w emojis are a known bug noone seems to know the cause for. But it seems Emoji Picker includes emojis not in the Noto Sans package? Image here: https://cloudsync.uol.de/s/DbPE9TL55Hpy9Mo
Your distro doesn't have the latest noto-coloremoji-fonts. Please ask your distro to update it.