When will the square black background bug be fixed?

Hi Reza_Ameri, Deleted , HotCakeX 

I am using the latest Windows build (21343), but this has been the case since versions released two years ago. And I have already reported this in the Feedback Hub (in fact, there are dozens of complaints about it there, made by other users).
One way I use to remove the black rectangle is to delete the thumbnail cache, then the folders icons are recreated and displayed correctly, until the black rectangles start to appear again in some folders created and changed (this happens at random).
I'm not going to commit suicide because of that, but it's annoying. And even small details are important because it shows how interested the developers are in delivering the best experience possible to users.