Graphical/shader glitches were seen with enemy Murky while he was stealthed via the Egg Hunt talent. First, he was entirely visible even though his mount was not visible. Then, in Safety Bubble graphical glitches were seen. The problem was seen once during the game. (There may not have been opportunities in that game to see the issue more than once.)
This was on the Mac client on Live server, Mac OS 10.14.1, Intel HD 4000, with all graphics settings set to Low/Off. The issue was seen both during the game and also watching the Replay later.