Created attachment 105957 [details] screenshot Kdenlive 17.04.1 shows generic Wayland icon in its window decoration and in plasma panel. See the screenshot please.
https://community.kde.org/Wayland/Porting_Notes#Application_Icon
See link by Christoph.
Eike, doesn't it need to be fixed inside kdenlive repository?
Yep.
Then let's reopen, until it actually is :)
17.12 RC has the same bug on Arch Linux.
Fixed in kdenlive 18.04, Arch. \o/