Photoshop 21.2 (latest update) bug canvas disappear

Hello everyone,

i'm having a problem with the latest version of Ps (21.2) basically, when i have a project opened on Ps, and i switch to another window, lets say finder (Mac) then,  if go back to Ps, the canvas doesn't show the artworks, in fact it showns only a "black screen" (only in the canvas area, the menus and everything else works fine), so its not until i scroll, or click, zoom out etc that the canvas with the artworks appears again.

as you can imagine this is very annoying while triying to paste assets by "drag and dropping" 

i'm using a Macbook pro Mac OS Mojave, 15inch 2017, Processor 2.8 Ghz intel core i7, Radeon Pro 555 2gb 

Any help is welcomed!

Fabio