I've had that same exact issue with the 2016 15" MBP in Chrome after a september logic board replacement, down to the shape of the glitch (that diagonal white boxy thing). Also happened in photos app while editing. Apple replaced the laptop.So I´m experiencing screen errors flashing for one second and disappearing randomly while watching videos on Safari. Does anyone have the same problem as me, or found a solution for this ? I reseted the T2 and PRAM and still nothing..