I just tested a 2015 MacBook Air (HD 6000 graphics) and still see the same display corruption. This seems to happen on all Intel Graphics Macs at least from HD 4000 and up and specifically your system, the 12-inch Retina MacBook, 2013 MacBook Air, and 2015 MacBook Air. Hopefully kettenis@ will have time to look at this eventually but he is very busy at the moment.
Bryan
