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@YuZhou-MSFT any update? Did you see the reproduction steps?

Is it with the same type of laptop and cable? Curious since @AvikChatterjee-8589 is able to reproduce.

Would like to clarify as much as possible since those feedback forms tend to be a black hole where I expect to hear nothing back. If that's all you can offer I will probably just switch to Brave or Chrome :/

I can also confirm it does not affect Google Chrome for example.

See my other comment, but the monitor is definitely core to the issue. Latest edge, no extensions, latest macOS is all you need other than that.

I think plugging my computer into the external monitor just made it happen again (the cable is USB-C to USB-C, version 3.2 gen 2 or whatever they call it right now).

  1. Yes it still persists

  2. Not sure, I can try to check but it's hard to tell as I use the computer with the display daily

  3. No, this only happens with edge

  4. The windows are missing immediately on wake


Okay, I took some time to find steps to reproduce, that still work on latest edge (88.0.705.50)

  1. Plug in an external monitor (I have an MSI Optix MAG272QP) via USB-C

  2. Open a new window, go to for example peanuts.com (then open some more tabs in the same window, I will explain why)

  3. Make that window fullscreen on the laptop's own monitor

  4. Switch to a different space than the fullscreen peanuts.com window

  5. Click Apple menu -> Sleep

  6. Wake the computer

  7. The peanuts.com window is now gone, typing peanuts.com in the url bar will let you "Switch to this tab", and if you had more than one tab open in that window, it will now reappear.

  8. If you only opened one tab, like I did while testing this, you're now stuck with a permanent missing window that contains only the tab peanuts.com, but edge won't let you switch to it, instead, clicking "Switch to this tab" just opens peanuts.com in a new tab.

I can't edit this comment but this is on latest edge (88.0.705.50), latest macOS (11.1) with no extensions enabled.