Has there been any progress on this? When I follow the link to that enhancement request posted by 262Hz I just get a page that says "Feedback not found"
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I'm having essentially the same problem. When I have app windows on an external display, then put the mac to sleep, and then wake it up again, the windows that were on the external display have shifted off of that display into an area outside of that display's viewable area (in my case, as though I had drug them off the screen to the left until they are completely off the screen. They are not, however, back on my Mac's display. To be able to see them or interact at all, I have to open mission control, drag them from the external monitor to the Mac's monitor, close mission control, and then drag them back to the external display.
None of this was a problem before upgrading to Big Sur.
How does one file a bug report?