A fork of the [7zip SourceForge project](https://sourceforge.net/projects/sevenzip/) made because the maintainers on sourceforge have ignored large problems in their system for too long, and sourceforge is so incredibly dated.
On windows 7-Zip 9.20 and 9.22, 7z archives encrypted with the "Encrypt file names" option will revert to not encrypting file names when a file or folder is added to the archive. This does not happen when files are changed or deleted.
There are working development instructions linked to in the README.md file, but they only cover windows. Copy the instructions from the website (give credit somewhere in the readme), and make instructions for other platforms.