This is very minor. To replicate:
- Go to ?>Whats New
- Find an external link
- Middle-click it
A blank window like this opens":
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It’s the same on Mac as well. I think it tries to open the link but it doesn’t work out so it’s just a blank screen and the title of the page is on the top of the window.
P.S.: I didn’t know what a middle click was before this and I literally had to download a middle click app for Mac to try this out 
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