As of the latest Roblox update roughly a few hours ago at the time of writing, screensharing Roblox to Discord will cause the screen to display properly for one frame, and go completely white afterwards.
Also, screensharing Roblox Studio results in a grey screen being displayed, with FILE at the top left
I haven’t recently tried sharing Roblox, but I can vouch for Studio not showing up correctly as of a couple days ago.
From my experience:
Studio doesn’t render the viewport correctly (I believe that’s the accurate term in this situation) - GUI elements (ie those in startergui) show up fine, it’s just anything in 3D space shows up invisible (the grey area presumably being the actual studio window background, light mode would likely be white)
Adding onto that, any sort of sub-window doesn’t want to appear. (ie properties, explorer, toolbox)
Even if it’s a currently selected tab on the same window as the main game area (opening the script editor up in the same sub-window/section as the main game view) it still shows that main game area (again, just the GUI part of it)