I have this issue sometimes when my mac is waking up from sleep. Some applications like Google Chrome A part or whole of the application is turning into a noise picture and until I restart the system, it won't fix.
In this screenshot I have opened inspect view of google chrome. In some websites, one part or whole of the website also, is being displayed like this.
I've updated to the latest version of Mac (Catalina 10.15.7) and chrome (86.0.4240.183 (Official Build) (x86_64)). Also this issue is happening when I use the main display or external display too. No differences.