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

https://github.com/unspecd/void-packages fix-update-check
https://github.com/void-linux/void-packages/pull/30590

xbps-src/update_check: automatically decompress the content
Fixes: #29429.

A patch file from https://github.com/void-linux/void-packages/pull/30590.patch is attached