Generic icon for application on Wayland KDE.

When I run my application in AppImage on KDE Wayland session, it has a generic Wayland icon in top corner and in Alt-Tab, but with a proper icon on the menu or in taskbar.

My app exports Wayland app ID, which is the same as icon name and desktop file name. It works properly outside of AppImage.

What else should I do?

Manually copying an app .desktop and icons to the host system fixes this, now the AppImage runs with the proper icon.