Indeed, it does the same at me, but it seems that as soon as an app is brought on screen by clicking on it in the taskbar, closing this app will unhide the taskbar. However, as soon as I switch to another window without using the taskbar, this behaviour will stop (closing any app will not unhide the taskbar). So it's only if the app has just been brought by clicking on it. And as you said, an app closed after it was opened from Windows Start Menu will not unhide it, unlike with Classic Shell. And I also have this delay before the taskbar disappears when opening an app from Classic Shell.
So it this weird behaviour seems to be caused mainly by Windows 10 right?
And maybe Classic Shell is doing something with the taskbar just after the app was opened (maybe because it opens the app, then tells the taskbar to hide while Windows menu does the opposite), and then it gives back the focus to that app by re-opening it from the taskbar, which would explain why closing that app unhides the taskbar just like if it had been clicked on?
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