Many Flatpaks displaying X.org logo rather than application icon in the window switcher (Fedora KDE) -- how to fix?

This is a KDE bug https://bugs.kde.org/show_bug.cgi?id=468129

Edit: Well, maybe not this exact bug, but it's related... Maybe add your issue to the tracker and reference this one.

Not only Flatpak, sometimes Snap and Appimage too. You can force by using 'Window Rules', open from System Settings > Window Management > Window Rules then choose 'Desktop file name'.

I have tried moving desktop files out of their flatpak directories and into /usr/share/applications

Icon set is breeze, and the icons are fine in krunner/application menu/dock. Have tried adwaita and a couple of other icon packs, same issue.

I don't really have advanced Linux knowledge, but I think that's because you are using Wayland (Fedora's default) and that specific program is running under XWayland and not Wayland itself, probably because it's not officially supported.

That happens to me in Wayland with Freetube, and some other programs.

Hi, this is AutoKonqi reporting on duty: this post was flaired as General Bug.

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Tried logging in with x11, same issue

Average IQ of Developers is dropping steadily to the point where most people in the field are mundane as fuck.

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This only proves it.