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

https://github.com/newbluemoon/void-packages lighttpd
https://github.com/void-linux/void-packages/pull/13027

lighttpd: fix log and data directory permissions
The user name for the lighttpd service was changed to `_lighttpd` a while ago, but the log and data directories are still created for owner `lighttpd` in a fresh installation.

A patch file from https://github.com/void-linux/void-packages/pull/13027.patch is attached