since 27.6 when brush or using any adjustment layer with mask the screen flick like the is no mask so a bit difficult to make adjustments.

since 2 or three version when brush or using any adjustment layer with mask the screen flick like the is no mask so a bit difficult to make adjustments. 
I attached a video what happens when using split frequency but also happens when using any adjustment layer, it doesn't matter how many layers, masks or if you brush to an empty layer or using adjustment layer and it will randomly do this weird effect if is a mask on the file.