Patch 7.3.2 hotfix5 build 25549 was released to Live and the PTR on November 22, 2017.
Blizzard previously acknowledged a problem with loading screens with Intel GPUs on the macOS.
^ Rommax 2017-03-29. #39 Load screens seem graphically glitches now :(. Official Mac Technical Support forum (US). Glitchy looking loading screens on Intel GPUs is a known issue. We're working on a fix. For the time being, it should be a benign issue. It only affects the appearance loading screens.