There is a new pull request by lonxwolx against master on the void-packages repository

https://github.com/lonxwolx/void-packages nm-tray
https://github.com/void-linux/void-packages/pull/39024

nm-tray: fix autostart file location
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sysconfdir not set, installs autostart file on /usr/etc/xdg/autostart

A patch file from https://github.com/void-linux/void-packages/pull/39024.patch is attached