There's a merged pull request on the void-packages repository

xfce4-panel: enable StatusNotifier support.
https://github.com/void-linux/void-packages/pull/34818

Description:
The Status Tray plugin then works properly for applications using the
StatusNotifier API. 

Fixes J-Lentz/iwgtk#21

Further background: https://forum.xfce.org/viewtopic.php?pid=65399#p65399

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