There is an updated pull request by crtxcr against master on the void-packages repository

https://github.com/crtxcr/void-packages fix_spotify_icon
https://github.com/void-linux/void-packages/pull/40897

spotify: Fix missing icon in KDE task manager
Spotify onlys get a generic "X11" icon in the task manager. No window title is shown either.

The template moves the "icons" folder provided by spotify to /usr/share/spotify. However, it appears that spotify searches for the icons in /usr/libexec/spotify.

Create a symlink to /usr/share/spotify/icons so spotify finds the icons again.

This makes the spotify icon appear in the KDE taskbar. It also sets the title of the spotify window.

Fixes: #36615

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A patch file from https://github.com/void-linux/void-packages/pull/40897.patch is attached