Yeah, I'm not sure if I can do anything on my side.  It looks like it's  an issue with the build patch (issue30487, commit d8d6b91, assuming that's what Zachary is referring to).  The blurb complaint is about something that appears should have been installed in a venv during the build process.  

If I need to upgrade or install something on the worker to support this change, I can certainly do that, but I don't immediately see what that should be.