Wayland icon is shown instead of VSCodium icon on KDE

[zartre]

Describe the bug

The default Wayland icon is displayed on the taskbar and in the app switcher on KDE Plasma 6.

Please confirm that this problem is VSCodium-specific

• [x] This bug doesn't happen if I use Microsoft's Visual Studio Code. It only happens in VSCodium.

Please confirm that the issue/resolution isn't already documented

• [x] I checked the Docs page and the Troubleshooting page and my issue is not mentioned there.

To Reproduce Steps to reproduce the behavior:

1. Open VSCodium
2. Observe the taskbar and the app switcher (Alt + Tab)

Expected behavior

VSCodium icon is used instead of Wayland icon.

Screenshots

Desktop (please complete the following information):

• OS: Fedora 40 with KDE Plasma 6.0.4
• Architecture: x64
• Version: 1.89.0
• App Manager: RPM
• Sandboxed: Flatpak