Running Kde Neon wayland liveCD (yesterday's build) , when I open Firefox (or VLC), the taskbar icon is that of X11, not of Firefox. Reproducible: Always
Please check the errata for known Wayland missing features and bugs: https://community.kde.org/Plasma/5.8_Errata#Wayland But good news: This was implemented recently and will be in 5.9.
I just read the blog post :) you guys are awesome. I suppose this could be closed... I'd suggest linking to this errata page directly from the desktop of the Neon liveCD. And I don't know which channel to go through for that to happen... Thanks.