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I plugged in two Studio Displays to the Mac Studio recently and experience similar issues where after a sleep / wake cycle, the windows move over to the main display from the secondary display. It’s annoying but it seems it’s more than just being unable to remember the window positions; macOS is unable to tell the two displays apart as it can only differentiate between displays if they’re either from different manufacturers OR have different manufacturing dates. It does not look at serial numbers. In my case both displays are from Apple and since I bought them on launch day, their manufacturing dates are the same as well 