the git repository is pretty much in sync with CVS: "cvs HEAD" corresponds to "git master" and "cvs oacs-5-9" corresponds to "git oacs-5-9".
The latest kernel is 5.9.1d16, so much has changed since 5.9.1d4.... yes, testing the actual version oacs-5-9 it would be useful (especially, if something more needs to be fixed).