Please note that the github master branches / alpha versions are development versions not officially released and where all the development is happening. Such versions might show unexpected behavior or could even break/be in a temporary unusable state at any time.
For productive use it is strongly suggested to stay with the official announced source code releases in About the Source Edition (GSE) category.
If you want to contribute to the development of those you probably need to dig into such issues on your own and could consider to contribute at the issue trackers of github: http://github.com/greenbone